use Angular Material overrides API

[andrewseguin]

Add --mat- prefixed variables alongside --mdc- variables because Angular Material will be renaming these tokens internally. This rename will occur in v20, which is used internally. The --mdc- tokens will continue to be defined since this still depends on an older version of Angular Material externally.

Includes necessary update to tensorboard/pip_package/setup.cfg, using underscore instead of dash-case for description_file

python3.11/site-packages/setuptools/dist.py:452: SetuptoolsDeprecationWarning: Invalid dash-separated options      
              ********************************************************************************
              Usage of dash-separated 'description-file' will not be supported in future
              versions. Please use the underscore name 'description_file' instead.
      
              This deprecation is overdue, please update your project and remove deprecated
              calls to avoid build errors in the future.
      
              See https://setuptools.pypa.io/en/latest/userguide/declarative_config.html for details.
              ********************************************************************************