[issue43428] Sync importlib_metadata enhancements through 3.7.

[Jason R. Coombs]

New submission from Jason R. Coombs <jaraco at jaraco.com>:

importlib metadata has added a few important [changes](https://importlib-metadata.readthedocs.io/en/latest/history.html#v3-7-0) since the last sync in issue42382 (importlib_metadata 3.3):

- Performance enhancements to distribution discovery.
- `entry_points` only returns unique distributions.
- Introduces new ``EntryPoints`` object for containing a set of entry points with convenience methods for selecting entry points by group or name.
- Added packages_distributions function to return a mapping of packages to the distributions that provide them.

----------
assignee: jaraco
components: Library (Lib)
messages: 388250
nosy: jaraco
priority: normal
severity: normal
status: open
title: Sync importlib_metadata enhancements through 3.7.
versions: Python 3.10

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue43428>
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