We've been using https://github.com/stamblerre/vscode-test-golsp to test
the golsp. Ideally, we'd like to add integration tests with the major
editors, so we're moving this basic extension into x/tools, with the
intention of integration tests here. This is not meant to be used by any
users of golsp; it is only for testing.
Change-Id: I7c45e7c638311d29629ff6d3291332e68cf4621a
Reviewed-on: https://go-review.googlesource.com/c/153438
Reviewed-by: Ian Cottrell <iancottrell@google.com>
