Implement basic LSP 3.17 pull diagnostics ('textDocument/diagnostic').
Only diagnostics for the current document are requested. This is
chiefly because virtually no server has been found to support the
'relatedDocumentSupport' sub-capability which would allow to test this.
* etc/EGLOT-NEWS: Announce pull diagnostics support.
* lisp/progmodes/eglot.el (eglot-client-capabilities): Announce
:diagnostic capability.
(eglot--flymake-diag-type): New function.
(eglot--flymake-make-diag): New function.
(eglot--flymake-push-report-fn): Rename from
eglot--current-flymake-report-fn.
(eglot-flymake-backend): Check for :diagnosticProvider and dispatch
to pull or push path.
(eglot--flymake-pull): New function.
(eglot--flymake-push): Rename from eglot--report-to-flymake.
(eglot-handle-notification textDocument/publishDiagnostics): Use
eglot--flymake-make-diag helper.
(eglot-ignored-server-capabilities): Add diagnosticProvider
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