Add Upload Part - Copy

[juliangruber]

This partially implements Upload Part - Copy:

• Upload part by copy
• Cross bucket
• x-amz-copy-source-range
• x-amz-copy-source-if-match
• x-amz-copy-source-if-none-match
• x-amz-copy-source-if-unmodified-since
• x-amz-copy-source-if-modified-since

This is as much as I personally need from this function.

[kherock]

Thanks for the quick PR! Let me know when you want me to review this.

[juliangruber]

I don't need this function any more so I'll let you decide what to do with this :)

[jeffbski-rga]

This is still good functionality. I currently need it in my project.

[codecov]

Codecov Report

Merging #443 (f31bb77) into main (eaa43c3) will increase coverage by 0.06%.
The diff coverage is 90.00%.

@@            Coverage Diff             @@
##             main     #443      +/-   ##
==========================================
+ Coverage   89.16%   89.22%   +0.06%     
==========================================
  Files          20       20              
  Lines        1375     1402      +27     
==========================================
+ Hits         1226     1251      +25     
- Misses        149      151       +2     

Impacted Files	Coverage Δ
lib/controllers/object.js	90.11% <89.65%> (-0.06%)	⬇️
lib/routes.js	78.75% <100.00%> (+0.70%)	⬆️

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[kherock]

I've improved the tests for this a bit and added support for copy ranges. the x-amz-copy-source-if-* headers are still unimplemented but should be straightforward to add later.