Add file path -> crc32 algorithm

[MrCreosote]

Can use the base64 encoded crc to validate uploads like so:

In [56]: fields
Out[56]:
{'key': 'somefile',
 'AWSAccessKeyId': 'admin',
 'policy':
'eyJleHBpcmF0aW9uIjogIjIwMjQtMDgtMjZUMjM6MzE6MDBaIiwgImNvbmRpdGlvbnMiOiBbeyJidWNrZXQiOiAidGVzdCJ9LCB7ImtleSI6ICJzb21lZmlsZSJ9XX0=',
 'signature': 'Ys4tVhnbR1fUrMgpm+1DRxXsWnY=',
 'x-amz-checksum-crc32': b'bwUq9A=='}

In [57]: with open("Dockerfile") as f:
    ...:     files = {"file": ("somefile", f)}
    ...:     res = requests.post(url["url"], data=fields, files=files)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.88%. Comparing base (4622caf) to head (e9fe607).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #23      +/-   ##
==========================================
+ Coverage   98.84%   98.88%   +0.04%     
==========================================
  Files           6        6              
  Lines         259      270      +11     
==========================================
+ Hits          256      267      +11     
  Misses          3        3              

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[Tianhao-Gu]

👍