feat(vscode): add GraphQL operations and fragments to the outline

[JoviDeCroock]

What / Why

GraphQL documents embedded in JavaScript and TypeScript were invisible to VS Code's Outline view and in-file symbol picker. This PR adds GraphQL operations and fragments as document symbols, including named operations, anonymous operations, and fragment type conditions.

This PR is stacked on #416, which introduces the VS Code extension.

Implementation

• Registers a VS Code DocumentSymbolProvider for JavaScript, JSX, TypeScript, and TSX.
• Detects documents in graphql(...) / gql(...) calls and tagged templates.
• Supports the custom graphqlsp.template editor setting.
• Masks template interpolations while preserving offsets, so symbols after interpolations map back to the source file correctly.
• Returns GraphQL symbols through the extension host, where VS Code actually requests document symbols. The previous tsserver getNavigationTree approach was removed because VS Code routes navtree through its syntax server, where language-service plugins are not loaded.
• Preserves TypeScript's normal symbols; VS Code shows separate GraphQLSP and TypeScript groups.

Test plan

• Extension document-symbol unit tests: 5 passed.
• Full e2e suite: 77 passed.
• VS Code extension build and VSIX packaging pass.
• Manually verified GraphQL operations/fragments in VS Code Outline.

Limitation

Custom template names configured only in tsconfig.json are not visible to the extension host. Custom names set through graphqlsp.template are supported.

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Latest commit: 7a74d42

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