Allow method handlers to return json rpc errors #20
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In this PR, we allow method handlers to return results that could themselves contain "result" and "error" fields. If they contain neither field, the old behavior is maintained. If they contain one or both fields, however, we read those fields and use them in the json rpc response.
This will be useful for addressing python-lsp/python-lsp-server#314 -- rather than raising an exception when we get a request post-shutdown, we'll be able to instead call a method that returns a json rpc invalid request.
See also python-lsp/python-lsp-server#432