Add typescript-language-server support

[Copilot]

Plan for Adding TypeScript Language Server Support

• Create src/lsp_client/clients/typescript.py with TypescriptClient, TypescriptServer, and TypescriptDockerServer
• Register the new client in src/lsp_client/clients/__init__.py
• Create an example file examples/typescript.py to demonstrate usage
• Update README.md to include typescript-language-server in the supported servers table
• Run linters and verify the implementation works
• Address code review feedback - removed unused attributes
• Remove call hierarchy capability (not reliably supported by typescript-language-server)
• Improve error message to mention both packages being installed
• Add Position import to example file for commented code
• Rename to TypescriptClient and TypescriptServer per maintainer feedback
• Add documentation references for settings and TypeScript dependency

Original prompt

Add support for typescript-language-server.

Reference: https://github.com/typescript-language-server/typescript-language-server
Docker Support: https://github.com/lspcontainers/dockerfiles/blob/main/servers/tsserver/Dockerfile

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[observerw]

@copilot Named it TypescriptServer and TypescriptClient

[Copilot]

@copilot Named it TypescriptServer and TypescriptClient

Renamed to TypescriptClient and TypescriptServer in commit bc1f3d6.