Add thumbnail_size property to ImageField

[jowilf]

No description provided.

[codecov-commenter]

Codecov Report

Merging #9 (a52e315) into main (dd3a6d3) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main        #9   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           24        24           
  Lines         1726      1729    +3     
=========================================
+ Hits          1726      1729    +3     

Impacted Files	Coverage Δ
sqlalchemy_file/helpers.py	100.00% <100.00%> (ø)
sqlalchemy_file/storage.py	100.00% <100.00%> (ø)
sqlalchemy_file/stored_file.py	100.00% <100.00%> (ø)
sqlalchemy_file/types.py	100.00% <100.00%> (ø)
tests/test_processor.py	100.00% <100.00%> (ø)

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