feat(workflows): Add pub.dev publishing workflow

Introduced a new GitHub Actions workflow for automatic publishing to pub.dev upon tagging. The workflow triggers on push events with version-like tags and uses the dart-lang/setup-dart action.

.github/workflows/publish.yaml

@@ -0,0 +1,16 @@
+name: Publish to pub.dev
+
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+*' # for tags like: '1.2.3'
+
+jobs:
+  publish:
+    permissions:
+      id-token: write # Required for authentication using OIDC
+    uses: dart-lang/setup-dart/.github/workflows/publish.yml@v1
+    with:
+      # Specify the github actions deployment environment
+      environment: pub.dev
+      # working-directory: path/to/package/within/repository