fix: Wrapping / Unwrapping Value well-known type in request/response serializers

[moufmouf]

Values of type google.protobuf.Value were not correctly wrapped/unwrapped when directly passed to a service (as a request or response).

As a result, calls to a service written like this:

service RoomApi {
    rpc echo(google.protobuf.Value) returns (google.protobuf.Value);
}

had to be written:

const value = Value.unwrap(await client.echo(Value.wrap({}));

instead of:

const value = await client.echo({});

This commit fixes this.

This should close #947

[stephenh]

This is a great PR @moufmouf , thank you!

It's especially nice that you found an integration test with a *.proto file that already covered this use case, and just needed tweaked to do the right thing. 🎉

[stephenh]

🎉 This PR is included in version 1.162.2 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release
• v1.162.2

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