Moving to importlib_metadata 0.9 or 0.17 on defaults channel

Same comment applied to #74 (closed) and #75 (closed). The package importlib_metadata is provided by the defaults channel.

We should be using that instead of our own custom built version.

This will require we:

1. Drop the recipe
2. Bump the build number and package requirements on the recipe of conda/pre-commit to force the use of the version on the defaults channel

This is not a runtime dependence of any of our packages (it is used for development only). We could also remove the versions of the package we distribute to clean-up new installs.