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## Summary
Closes: astral-sh/ty#88
This PR implements an initial version of a mock language server that can
be used to write e2e tests using the real server running in the
background.
The way it works is that you'd use the `TestServerBuilder` to help
construct the `TestServer` with the setup data. This could be the
workspace folders, populating the file and it's content in the memory
file system, setting the right client capabilities to make the server
respond correctly, etc. This can be expanded as we write more test
cases.
There are still a few things to follow-up on:
- ~In the `Drop` implementation, we should assert that there are no
pending notification, request and responses from the server that the
test code hasn't handled yet~ Implemented in [`afd1f82`
(#19391)](afd1f82bde)
- Reduce the setup boilerplate in any way we can
- Improve the final assertion, currently I'm just snapshotting the final
output
## Test Plan
Written a few test cases.