This does NOT intended to break the dependency from cider to
clojure-mode. It is intended to make CIDER work with clojure-ts-mode.

Some functionality like clojure-find-ns, clojulore-find-def, etc will
still require clojure-mode in order for CIDER to get it's work done.

Adds util functions for checking if buffer is managed by a clojure mode

Address cl-flet lint warning

... with a simpler implementation of cider--setup-clojure-major-mode.
Can't have cl-flet lint warnings if I don't use cl-flet.

Add clojure-ts-mode dependency to Eldev

Silence byte-compiler when optional clojure-ts-mode is not available

The linter throws a warning when byte-compiling. Eldev doesn't support
pulling in dependencies declared with `eldev-add-extra-dependencies`
while running the `eldev compile` command. See
https://emacs-eldev.github.io/eldev/#additional-dependencies

This makes sense. If a user is byte compiling cider and they don't have
clojure-ts-mode installed, they shouldn't see a byte compile warning for
it.

Make clojure-ts-mode dependency optional

Tests will fail when using Emacs versions less than 29 because
clojure-ts-mode requires Emacs 29 to work properly. That could be why
tests fail in CI. This probably won't help with the linting issue

Includes top level "main" tests, plus an additional
clojure-ts-mode/* tests.

This also tries to install the language grammar in the CI environment.
Git and CC are required. This works in github actions

Particularly the caveats page, where we describe some of the things
clojure-ts-mode is currently lacking.