feat(connect): add support for File type in requests

[cromoteca]

Switches to multipart requests if a File object is found anywhere in the body object.

Closes #3132

[codecov]

Codecov Report

Attention: Patch coverage is 92.30769% with 2 lines in your changes missing coverage. Please review.

Project coverage is 92.91%. Comparing base (c2d0e1c) to head (deb3777).

Files with missing lines	Patch %	Lines
packages/ts/frontend/src/Connect.ts	92.30%	0 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3189      +/-   ##
==========================================
+ Coverage   92.89%   92.91%   +0.02%     
==========================================
  Files          85       85              
  Lines        3334     3359      +25     
  Branches      801      807       +6     
==========================================
+ Hits         3097     3121      +24     
  Misses        184      184              
- Partials       53       54       +1     

Flag	Coverage Δ
unittests	92.91% <92.30%> (+0.02%)	⬆️

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[sonarqubecloud]

Quality Gate failed

Failed conditions
40.2% Duplication on New Code (required ≤ 3%)

See analysis details on SonarQube Cloud