x/tools/gopls: trace of error response is missing

[hyangah]

I triggered a codeAction that will fail and couldn't find the matching "Received response ..." from gopls trace.
The 'Error' entry is from vscode client (in response of the error reply) and doesn't include the message id. This makes it difficult for trace viewer to process the trace.

[Trace - 18:36:44.832 PM] Sending request 'textDocument/codeAction - (8)'.
Params: {"textDocument":{"uri":"file:///Users/hakim/hello/b.go"},"range":{"start":{"line":0,"character":1},"end":{"line":0,"character":1}},"context":{"diagnostics":[]}}

...
[Error - 6:36:44 PM] Request textDocument/codeAction failed.
  Message: no packages returned: packages.Load error
  Code: 0 

The following is the corresponding trace recorded from the client side.

[Trace - 6:36:44 PM] Sending request 'textDocument/codeAction - (8)'.
Params: {
    "textDocument": {
        "uri": "file:///Users/hakim/hello/b.go"
    },
    "range": {
        "start": {
            "line": 0,
            "character": 1
        },
        "end": {
            "line": 0,
            "character": 1
        }
    },
    "context": {
        "diagnostics": []
    }
}
...
[Trace - 6:36:44 PM] Received response 'textDocument/codeAction - (8)' in 39ms. Request failed: no packages returned: packages.Load error (0).