[3.8] bpo-37741: Make importlib.metadata a simple module (GH-15153)

[miss-islington]

(cherry picked from commit 3a5c433)

Co-authored-by: Barry Warsaw barry@python.org

https://bugs.python.org/issue37741

[miss-islington]

@warsaw and @jaraco: Status check is done, and it's a failure ❌ .

[miss-islington]

@warsaw and @jaraco: Status check is done, and it's a failure ❌ .

[miss-islington]

@warsaw and @jaraco: Status check is done, and it's a failure ❌ .

[miss-islington]

@warsaw and @jaraco: Status check is done, and it's a failure ❌ .

[miss-islington]

@warsaw and @jaraco: Status check is done, and it's a failure ❌ .

[miss-islington]

@warsaw and @jaraco: Status check is done, and it's a success ✅ .

[miss-islington]

@warsaw and @jaraco: Status check is done, and it's a success ✅ .