Client terminates server process if it doesn't recognise a method #204
Description
Due to how the error handling is currently implemented, if the server sends an unexpected request method the client will immediately end the session and terminate the server process.
Apart from being an over-reaction, it can lead you spend a lot of time debugging the wrong thing!
----------------------------------------------------------- Captured log setup ------------------------------------------------------------
WARNING pygls.protocol.json_rpc:json_rpc.py:394 Failed to handle request '930cd9bb-a46a-4737-bac0-355d749c524b', unknown method 'workspace/diagnostic/refresh'
========================================================= short test summary info =========================================================
ERROR tests/e2e/test_e2e_diagnostics.py::test_rst_document_diagnostic - RuntimeError: Server process 70277 exited with return code: -15
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