…e, if possible

importlib does not cache metadata in-memory, so querying even simple
attributes like distribution names and versions can quickly become
expensive (as each access requires reading METADATA). Fortunately,
`Distribution.canonical_name` is optimized to parse the metadata
directory name to query the name if possible. This commit extends this
optimization to the finder implementation and version attribute.

.egg-info directory names tend to not include the version so they are
not considered for optimizing version lookup.

simplewheel-2.0-1-py2.py3-none-any.whl had to be modified to rename the
.dist-info directory which mistakenly included the wheel build tag (in
violation of the wheel specification).

    simplewheel/__init__.py
    simplewheel-2.0-1.dist-info/DESCRIPTION.rst
    simplewheel-2.0-1.dist-info/metadata.json
    simplewheel-2.0-1.dist-info/top_level.txt
    simplewheel-2.0-1.dist-info/WHEEL
    simplewheel-2.0-1.dist-info/METADATA
    simplewheel-2.0-1.dist-info/RECORD

Otherwise, it was mistaken for part of the version and led pip to think
the wheel was a post-release, breaking tests...

Co-authored-by: Tzu-ping Chung <uranusjr@gmail.com>