feature: re-arrange message models to handle images

[gounux]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 98.75000% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.84%. Comparing base (bbf740f) to head (55fb1c3).

Files with missing lines	Patch %	Lines
gischat/models.py	97.43%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #33      +/-   ##
==========================================
+ Coverage   86.12%   88.84%   +2.71%     
==========================================
  Files           4        3       -1     
  Lines         209      233      +24     
  Branches       27       28       +1     
==========================================
+ Hits          180      207      +27     
+ Misses         23       20       -3     
  Partials        6        6              

Flag	Coverage Δ
unittests	88.84% <98.75%> (+2.71%)	⬆️

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