Exit a language server if it sends a message with invalid json (#9332)

* Keep lsp event listener thread alive when malformed json is encountered from the lsp server

* Update unexpected error flow in recv() to close outstanding requests and close the language server

* Log malformed notifications as info instead of error

* Make close_language_server a nested function inside recv, similar to what's done in send

* Update malformed notification log text

* Clean up new log text a bit

* Initialize recv_buffer closer to where it's used

* Use "exit" instead of "close"

* Remove whitespace

* Remove the need for a helper method to exit the language server

* Match on Unhandled error explicitly and keep catch-all error case around

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