Enable test of types in CI

[hoxbro]

Currently, we just ran mypy, this will make it so it fails if type testing fails. I have, set it up so you manually have to enable modules.

Copied settings from: https://github.com/bokeh/bokeh/blob/bba83ab0db6986f5b8e82ab01e2ad2d09b877cea/pyproject.toml

Commented out strict for now, as it have many failing tests. Currently, I see two failing tests.

Currently two errors, the changes in the codebase is to fix other errors.

panel/io/cache.py: note: In function "cache":
panel/io/cache.py:472:23: error: Incompatible types in "await" (actual type "_R", expected type "Awaitable[Any]")  [misc]
                    ret = await func(*args, **kwargs)
                          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
panel/io/cache.py:515:12: error: Incompatible return value type (got "_Wrapped[_P, _R, _P, Coroutine[Any, Any, _R]]", expected "_CachedFunc[Callable[_P, _R]] | Callable[[Callable[_P, _R]], _CachedFunc[Callable[_P, _R]]]")  [return-value]
        return wrapped_func
               ^~~~~~~~~~~~
Found 2 errors in 1 file (checked 341 source files)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.24%. Comparing base (e7c8ced) to head (d22b96e).

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #7151       +/-   ##
===========================================
+ Coverage   41.17%   82.24%   +41.06%     
===========================================
  Files         315      327       +12     
  Lines       46759    48972     +2213     
===========================================
+ Hits        19255    40277    +21022     
+ Misses      27504     8695    -18809     

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