feat: methods for signed url uploads

[anand2312]

This PR

• adds a create_signed_upload_url method
• adds a upload_to_signed_url method
• adds documentation for typed dicts used in the library for headers/responses
• closes Storage uploads do not have cache-control header #63 by setting the cache-control header correctly during uploads

(part of #84)

[codecov-commenter]

Codecov Report

Patch coverage: 83.33% and project coverage change: -0.34 ⚠️

Comparison is base (e5df2ff) 85.71% compared to head (2b65b0e) 85.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #107      +/-   ##
==========================================
- Coverage   85.71%   85.38%   -0.34%     
==========================================
  Files          12       12              
  Lines         371      431      +60     
==========================================
+ Hits          318      368      +50     
- Misses         53       63      +10     

Impacted Files	Coverage Δ
storage3/_async/file_api.py	84.48% <82.14%> (-0.75%)	⬇️
storage3/_sync/file_api.py	84.48% <82.14%> (-0.75%)	⬇️
storage3/types.py	95.74% <100.00%> (+0.39%)	⬆️

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