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.

• support for executeCommand to produce additional output streams through the progress notification mechanism microsoft/language-server-protocol#2014
• support for generalized "references" queries microsoft/language-server-protocol#1911
• new feature: describe (type of) selected expression microsoft/language-server-protocol#1466
• Support refactors that require user input/options microsoft/language-server-protocol#1164
• LSP window/showDocument{external=false, takeFocus=true} does not raise the editor window microsoft/vscode#207634
• Support multiple output channels for log message notifications microsoft/language-server-protocol#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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