Support going to type definition with tsserver

[alexlafroscia]

ale.vim supports going to a type definition, tsserver supports going to a type definition, but ale.vim doesn't support using tsserver to go to a type definition!

This adds support for going to a type definition using tsserver.

I added tests to the best of my ability by duplicating/altering some of the existing tests. I ran the ./run-tests script locally and everything seems to be passing, but let me know if there are parts that I missed!

[hsanson]

ALE migrated from Travis to Github Actions (see #3548) so it is necessary to rebase this PR from latest master branch to trigger the required checks.

# Add dense-analysis as remote upstream on your local fork. Not 
# needed if already added.
git remote add upstream https://github.com/dense-analysis/ale.git

# Sync your local master with upstream master
git checkout master
git fetch upstream master
git merge upstream/master

# Rebase the PR branch with master
git checkout my-branch-name
git rebase master   # Fix any conflicts you may have

# Force push the updated PR branch to origin to trigger the checks
git push -f origin my-branch-name

[alexlafroscia]

Thanks for calling this out @hsanson ! I'll take care of that

[alexlafroscia]

FYI, I needed to update my remote connection to use SSH for auth rather than HTTP, due to something around workflow permissions. I don't know if that has something to do with my personal authentication permissions, or if that's an across-the-board requirement, but I've run into issues wit forks, GitHub Actions and HTTP auth in the past as well

[stale]

This pull request has been automatically marked as stale because it has not been updated recently. Make sure to write tests and document your changes. See :help ale-dev for information on writing tests.
If your pull request is good to merge, bother w0rp or another maintainer again, and get them to merge it.

[alexlafroscia]

As far as I know, things should be working here -- I'm not sure why the checks appear to be stalled out. Is there something I can do @w0rp ?

[w0rp]

I'll commit that suggestion and merge this. Sorry I didn't look at it for so long. I've been variously busy and/or demoralised from the pandemic. I'm glad @hsanson has been around to get things merged in my absence.

[w0rp]

Cheers! 🍻

[alexlafroscia]

Thanks @w0rp! The delay is no trouble at all😀