feat: Revise createFile logic to return modified filenames and location

[AdrianCurtin]

• Add error handling for key generation
• Standardize return object with location, url (possibly signed), and filename / key without prefix
• Add support for optional config parameter to allow getFileLocation to be called internally (prevent a double call from the serverside potentially)
• Return s3 response explicitly as a separate variable

If parse-community/parse-server#9557 is merged,
this will address #237

This change will affect specific tests that check the response.Location argument and may affect any direct adapter usage of createFile that explicitly uses the s3 server response.

Closes: #237

[parse-github-assistant]

Thanks for opening this pull request!

[codecov]

Codecov Report

Attention: Patch coverage is 75.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 96.33%. Comparing base (0e0d721) to head (5abd18a).
Report is 12 commits behind head on master.

Files with missing lines	Patch %	Lines
index.js	75.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
+ Coverage   95.60%   96.33%   +0.72%     
==========================================
  Files           2        2              
  Lines         205      218      +13     
  Branches       44        0      -44     
==========================================
+ Hits          196      210      +14     
+ Misses          9        8       -1     

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