LSP: ignore not only server notifications but all requests as welllsp

* We use 23 now as the "id" for all JSON-RPC requests.
* Every message with a different "id" can be ignored,
  as it is a request, we haven't advertised to support.
  Alternatively, we should perhaps send an error response to
  unexpected requests?
* Fixes support for the ccls server which sends window/workDoneProgress/create
  even though I didn't advertise it.
  ccls cannot practically be used with FTsymbol$ though since it returns
  full declarations.
  You can perform a fuzzy symbol search, though.

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