Change to src-layout

[oittaa]

https://setuptools.pypa.io/en/latest/userguide/package_discovery.html#src-layout

[codecov-commenter]

Codecov Report

Merging #164 (b1a6cc3) into main (48d9c83) will decrease coverage by 88.01%.
The diff coverage is n/a.

❗ Current head b1a6cc3 differs from pull request most recent head ac8c616. Consider uploading reports for the commit ac8c616 to get more accurate results

@@            Coverage Diff             @@
##             main    #164       +/-   ##
==========================================
- Coverage   88.01%   0.00%   -88.02%     
==========================================
  Files           7       7               
  Lines         876     876               
  Branches      122       0      -122     
==========================================
- Hits          771       0      -771     
- Misses         77     876      +799     
+ Partials       28       0       -28     

Flag	Coverage Δ
unittests	0.00% <ø> (-88.02%)	⬇️

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Impacted Files	Coverage Δ
src/gcp_storage_emulator/__main__.py	0.00% <ø> (ø)
src/gcp_storage_emulator/exceptions.py	0.00% <ø> (ø)
src/gcp_storage_emulator/handlers/buckets.py	0.00% <ø> (ø)
src/gcp_storage_emulator/handlers/objects.py	0.00% <ø> (ø)
src/gcp_storage_emulator/server.py	0.00% <ø> (ø)
src/gcp_storage_emulator/settings.py	0.00% <ø> (ø)
src/gcp_storage_emulator/storage.py	0.00% <ø> (ø)
... and 4 more

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