perf(lsp): add built-in tracing support for the LSP

[bartlomieju]

adds tracing and opentelemetry exporting to the LSP.

enable it in .vscode/settings.json (or wherever you configure the LSP), like

{
  "deno.tracing": true
}

which will by default export opentelemetry traces to localhost:4317
or

{
  "deno.tracing": {
    // all fields optional
     "collector": "openTelemetry" (default) | "logging" (output in lsp log window)
     "collectorEndpoint": "http://localhost:4318" (for opentelemetry)
     "enable": true | false,
     "filter": "info" // defaults to "info", but can be any span filter
   }
}

---

a full working setup would be

1: Run jaeger (an opentelemetry collector with a nice UI):

docker run --rm -p 16686:16686 -p 4317:4317 jaegertracing/jaeger

2. Enable in .vscode/settings.json

{
  "deno.tracing": true
}

3. Restart LSP (right now it only will start the opentelemetry exporter on LSP startup)
4. open http://localhost:16686 in your browser

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[bartlomieju]

Do you want to actually address this? If not, then open an issue so it doesn't get lost