Egor/zed extension (#2044)

Fixes #932

### Changes:
- Embed playground server in the language server (LSP).
  - Allows support for any editor that supports LSP protocol.
- Modify `language_server/server.rs` to launch the server on first
available localhost starting at port `3030`. If `3030` is taken will try
`3031` etc.
  - Sends events on every LSP `did_change`
  - Selects function on function ctrl + hover
  - Code actions for opening playground in browser
- Create a new zed extension under `engine/zed` which packages the new
embedded playground via LSP
- **Embedding structure:** Wasm language runtime -> fiddle frontend ->
baml-cli (LSP) -> zed-extension -> Wasm extension package.
- Syntax highlighting partially implemented using the existing
tree-sitter implementation
- Added connection status for playground frontend on connection lost

### Known Issues:
- Syntax highlighting is not fully implemented:
  - Jinja highlighting does not work
  - Incorrect field and type highlighting

### Notes:
- May be useful to batch updates from LSP to not spam frontend
- Entire frontend is now embedded in LSP increasing file size
- Local baml version handling is currently not implemented
<!-- ELLIPSIS_HIDDEN -->


----

> [!IMPORTANT]
> Embed playground server in language server for LSP support and add Zed
extension for packaging, with partial syntax highlighting and connection
status indicator.
> 
>   - **Behavior**:
> - Embed playground server in `language_server` to support any
LSP-compatible editor.
>     - Launches on first available localhost port starting at `3030`.
> - Sends events on LSP `did_change`, supports function selection on
hover, and code actions for opening playground.
>   - **Zed Extension**:
> - New extension under `engine/zed` packages embedded playground via
LSP.
> - Embedding structure: Wasm language runtime -> fiddle frontend ->
baml-cli (LSP) -> zed-extension -> Wasm extension package.
>     - Partial syntax highlighting using tree-sitter.
>   - **Playground Frontend**:
>     - Added connection status indicator for connection loss.
>   - **Known Issues**:
> - Incomplete syntax highlighting: Jinja and incorrect field/type
highlighting.
>     - Local baml version handling not implemented.
>   - **Misc**:
> - Added `build.sh` script in `language_server/scripts` for building
web-panel.
> - Updated `Cargo.toml` and `Cargo.lock` for new dependencies and
configurations.
> 
> <sup>This description was created by </sup>[<img alt="Ellipsis"
src="https://img.shields.io/badge/Ellipsis-blue?color=175173">](https://www.ellipsis.dev?ref=BoundaryML%2Fbaml&utm_source=github&utm_medium=referral)<sup>
for 7cc5efb. You can
[customize](https://app.ellipsis.dev/BoundaryML/settings/summaries) this
summary. It will automatically update as commits are pushed.</sup>


<!-- ELLIPSIS_HIDDEN -->

---------

Co-authored-by: hellovai <vbv@boundaryml.com>
Co-authored-by: Greg Hale <imalsogreg@gmail.com>
Co-authored-by: Rahul Tiwari <jprrahultiwari@gmail.com>
Co-authored-by: aaronvg <aaron@boundaryml.com>
Co-authored-by: Sam Lijin <sam@boundaryml.com>
Co-authored-by: Chris Watts <chris@boundaryml.com>
Co-authored-by: Antonio Sarosi <sarosiantonio@gmail.com>

Author: 8 people

.github/workflows/primary.yml

@@ -53,6 +53,9 @@ jobs:
       - name: Check TS Lint
         run: pnpm biome ci . --organize-imports-enabled=false
         working-directory: typescript
+      - name: Build web-panel for language server
+        run: bash ./scripts/build.sh
+        working-directory: engine/language_server
       - name: Check Rust Formatter
         # rustfmt can only run unstable features on stable toolchains if passed
         # through CLI. We don't want to download 2 toolchains just for this.
@@ -82,12 +85,19 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: stable
+      - run: rustup target add wasm32-unknown-unknown
       - uses: Swatinem/rust-cache@v2
         with:
           workspaces: engine
       - name: Install Node
         run: pnpm install --frozen-lockfile
         working-directory: engine/language_client_typescript
+      # This step is necessary to guarantee that the language server has a frontend to embed.
+      # Is also included in build and integ-tests steps.
+      - name: Build web-panel for language server
+        run: bash ./scripts/build.sh
+        working-directory: engine/language_server
+      # ------------------------------------------------------------
       - name: Build Node
         run: pnpm build:debug
         working-directory: engine/language_client_typescript
@@ -122,6 +132,21 @@ jobs:
       - name: Ensure No Changes (3 of 3)
         run: |
           git diff --exit-code || (echo "::error:: merge canary and run codegen again" && exit 1)
+  build-wasm:
+      runs-on: ubuntu-latest
+      steps:
+        - uses: actions/checkout@v4
+        - uses: jdx/mise-action@v2
+        - uses: dtolnay/rust-toolchain@stable
+          with:
+            toolchain: stable
+        - run: rustup target add wasm32-unknown-unknown
+        - uses: Swatinem/rust-cache@v2
+          with:
+            workspaces: engine
+        - name: Build rust for wasm32
+          run: cargo build --target=wasm32-unknown-unknown
+          working-directory: engine/baml-schema-wasm
   build:
     runs-on: ubuntu-latest
     steps:
@@ -130,6 +155,7 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: stable
+      - run: rustup target add wasm32-unknown-unknown
       - uses: Swatinem/rust-cache@v2
         with:
           workspaces: engine
@@ -162,25 +188,13 @@ jobs:
       #   env:
       #     SRB_YES: "1"
       #   run: bundle exec tapioca init
+      - name: Build web-panel for language server
+        run: bash ./scripts/build.sh
+        working-directory: engine/language_server
       - name: Test Rust
         # skip doctests & integration tests (the latter require OPENAI_API_KEY and ANTHROPIC_API_KEY to be set)
         run: cargo test --lib
         working-directory: engine
-  build-wasm:
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - uses: jdx/mise-action@v2
-      - uses: dtolnay/rust-toolchain@stable
-        with:
-          toolchain: stable
-      - run: rustup target add wasm32-unknown-unknown
-      - uses: Swatinem/rust-cache@v2
-        with:
-          workspaces: engine
-      - name: Build rust for wasm32
-        run: cargo build --target=wasm32-unknown-unknown
-        working-directory: engine/baml-schema-wasm
   integ-tests:
     runs-on: ubuntu-latest
     steps:
@@ -193,9 +207,13 @@ jobs:
       - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: stable
+      - run: rustup target add wasm32-unknown-unknown
       - uses: Swatinem/rust-cache@v2
         with:
           workspaces: engine
+      - name: Build web-panel for language server
+        run: bash ./scripts/build.sh
+        working-directory: engine/language_server
       - name: run python tests
         run: |
           cd integ-tests/python