LSP: support for document links

[icholy]

The LSP protocol supports fetching a list of clickable links in a document using the textDocument/documentLink method: https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#textDocument_documentLink

Examples of LSP servers which support it:

• gopls uses it to link imports to the documentation website.
• jsonls and yamlls use it to link $refs in openapi/swagger documents.

[notpeter]

Thanks for reporting. I've created an associated feature tracking issue:

• LSP: support for document links (textDocument/documentLink) #33587

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