Run clojure-mode's test suite

[vemv]

As discussed in clojure-emacs/cider#3461, the https://github.com/clojure-emacs/clojure-mode/tree/master/test tests could be copied here, and then run in a CI matrix.

Note that although clojure-mode uses circleci, I'd recommend GHA more, these days.

Please use an Emacs and OS matrix similar to CIDER's.

Do feel free to disable tests that don't make sense here, or that can be left for later.

I'd suggest using the Eldev file to disable such tests, rather than deletion or commenting out. (That way one may be able to even git-clone clojure-test at a fixed tag, and run test/ verbatim).

Cheers - V

[dannyfreeman]

I'm going to attempt to have these tests pulled into the repo in a way that preserves the history and contributors. I think I should be able to do something to the effect of:

1. Fork clojure-mode
2. re-write the history in such a way that only the tests folder is present in the repository.
3. Add it as a remote to my local clojure-ts-mode repo.
4. Create a merge commit between a clojure-mode commit and latest clojure-ts-mode.