x/tools/gopls: upstream feature requests

[adonovan]

This issue is a place to record all pending upstream requests for changes to LSP and/or VS Code.

• [ ] https://github.com/microsoft/language-server-protocol/issues/2014
• [ ] https://github.com/microsoft/language-server-protocol/issues/1911
• [ ] https://github.com/microsoft/language-server-protocol/issues/1466
• [ ] https://github.com/microsoft/language-server-protocol/issues/1164
• [ ] https://github.com/microsoft/vscode/issues/207634
• [ ] https://github.com/microsoft/language-server-protocol/issues/1885

[gabyhelp]

Related Issues and Documentation

• x/tools/gopls: implement callHierarchy #39461 (closed)
• x/tools/gopls: support workspace/Symbol request #33844 (closed)

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