Adjust imports to ensure wildcard imports are prohibited

[bdraco]

What do these changes do?

We do not want to support wildcard imports, make sure they do not work.

Note that I did not mark this as a breaking change as this library is too new and I don't think anyone else is using it yet.

#24 (comment)

Are there changes in behavior for the user?

Wildcard imports are no longer supported

Related issue number

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.

Project coverage is 87.54%. Comparing base (f7ac8b1) to head (a4242dc).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/propcache/__init__.py	85.71%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #32      +/-   ##
==========================================
+ Coverage   87.50%   87.54%   +0.04%     
==========================================
  Files          22       22              
  Lines         768      771       +3     
  Branches       65       63       -2     
==========================================
+ Hits          672      675       +3     
  Misses         68       68              
  Partials       28       28              

Flag	Coverage Δ
CI-GHA	87.54% <90.90%> (+0.04%)	⬆️
MyPy	67.72% <72.72%> (+0.10%)	⬆️
OS-Linux	98.67% <100.00%> (+<0.01%)	⬆️
OS-Windows	93.89% <100.00%> (+0.04%)	⬆️
OS-macOS	94.38% <100.00%> (+0.03%)	⬆️
Py-3.10.11	93.39% <100.00%> (+0.04%)	⬆️
Py-3.10.15	96.03% <100.00%> (+0.02%)	⬆️
Py-3.11.10	96.03% <100.00%> (+0.02%)	⬆️
Py-3.11.9	93.39% <100.00%> (+0.04%)	⬆️
Py-3.12.6	95.93% <100.00%> (+0.02%)	⬆️
Py-3.13.0-rc.3	95.93% <100.00%> (+0.02%)	⬆️
Py-3.8.10	93.70% <100.00%> (+0.04%)	⬆️
Py-3.8.18	96.35% <100.00%> (+0.02%)	⬆️
Py-3.9.13	93.37% <100.00%> (+0.04%)	⬆️
Py-3.9.20	96.02% <100.00%> (+0.02%)	⬆️
Py-pypy7.3.11	96.16% <100.00%> (+0.02%)	⬆️
Py-pypy7.3.16	95.78% <100.00%> (+0.03%)	⬆️
Py-pypy7.3.17	95.80% <100.00%> (+0.03%)	⬆️
VM-macos-latest	94.38% <100.00%> (+0.03%)	⬆️
VM-ubuntu-latest	98.67% <100.00%> (+<0.01%)	⬆️
VM-windows-latest	93.89% <100.00%> (+0.04%)	⬆️
pytest	98.54% <100.00%> (+<0.01%)	⬆️

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