Allow storage extra & headers attributes

[jowilf]

• Allow storage extra & headers attributes
• Add tests
• Update docs

[codecov]

Codecov Report

Base: 100.00% // Head: 99.83% // Decreases project coverage by -0.16% ⚠️

Coverage data is based on head (c0e40d9) compared to base (bdb9ba1).
Patch coverage: 88.46% of modified lines in pull request are covered.

❗ Current head c0e40d9 differs from pull request most recent head 5d7c683. Consider uploading reports for the commit 5d7c683 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##              main      #18      +/-   ##
===========================================
- Coverage   100.00%   99.83%   -0.17%     
===========================================
  Files           24       24              
  Lines         1755     1766      +11     
===========================================
+ Hits          1755     1763       +8     
- Misses           0        3       +3     

Impacted Files	Coverage Δ
sqlalchemy_file/mutable_list.py	100.00% <ø> (ø)
sqlalchemy_file/types.py	98.82% <66.66%> (-1.18%)	⬇️
sqlalchemy_file/file.py	98.38% <90.00%> (-1.62%)	⬇️
sqlalchemy_file/processors.py	100.00% <100.00%> (ø)
sqlalchemy_file/storage.py	100.00% <100.00%> (ø)

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