bug#65983: Eglot does not support `textDocument/diagnostic` (pull diagnostics)

[Justin Talbott]

Some LSP servers, such as `ruby-lsp` (https://github.com/Shopify/ruby-lsp) don't use `textDocument/publishDiagnostic` to publish diagnostics. Instead, they expect the LSP client to poll and request diagnostics with `textDocument/diagnostic`. It would be great if Eglot would support this method of pulling diagnostics.

I first reported this on Github in the Eglot repo as a Discussion:

https://github.com/joaotavora/eglot/discussions/1290

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best,
Justin Talbott