cli: add IDE/terminal auto-detect from baml-cli init (#2178)

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> [!IMPORTANT]
> Add IDE/terminal auto-detection and extension installation to BAML CLI
initialization with interactive UI feedback.
> 
>   - **Behavior**:
> - Adds IDE/terminal auto-detection in `init.rs` to identify VSCode or
Cursor and install the BAML extension.
> - Updates `InitArgs::run()` to include steps for detecting and
installing editor extensions.
> - Introduces `InitUIContext` in `init_ui.rs` for interactive CLI
feedback during initialization.
>   - **Dependencies**:
> - Adds `ratatui` and `crossterm` to `Cargo.toml` for terminal UI
support.
>   - **Misc**:
>     - Adds `baml.mdc` to `initial_project` for Cursor rules setup.
>     - Updates `Cargo.lock` with new dependencies and versions.
> 
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Author: ba11b0y

engine/Cargo.lock

@@ -189,6 +189,8 @@ walkdir = "2.5.0"
 which = "6.0.3"
 indicatif = "0.17"
 junit-report = "0.8.3"
+ratatui = "0.29"
+crossterm = "0.28"
 
 
 [features]