Implement batch support for copy

[wosc]

Note, most/all error handling is missing (notfound, conflict, etc). I'm not sure how the real handling of those cases works, and to be fair, for my simple needs it just did not matter this far, they have all been happy path cases. I currently don't intend to work on this further, but I figured, I'd rather post a rough draft than nothing at all.

[oittaa]

lgm

[oittaa]

lgtm, let's see if the CI runs this time

[wosc]

I've now tried to fix the linter issues.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 81.13208% with 10 lines in your changes missing coverage. Please review.

Project coverage is 86.05%. Comparing base (679e20d) to head (98d2c6e).
Report is 14 commits behind head on main.

Files	Patch %	Lines
src/gcp_storage_emulator/handlers/objects.py	81.13%	7 Missing and 3 partials ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #260      +/-   ##
==========================================
- Coverage   86.54%   86.05%   -0.50%     
==========================================
  Files           7        7              
  Lines         892      925      +33     
  Branches      121      122       +1     
==========================================
+ Hits          772      796      +24     
- Misses         92       99       +7     
- Partials       28       30       +2     

Flag	Coverage Δ
unittests	86.05% <81.13%> (-0.50%)	⬇️

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[wosc]

Hrm. Sorry. Somehow the local lint installation behaved differently than the one on CI.