[API] update api for multi file and pdf support

[felixdittrich92]

This PR:

• update API template to support multiple images and/or pdfs
• add config options
• extend tests

Any feedback is welcome 🤗

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.81%. Comparing base (8c85c36) to head (73e3faa).
Report is 1 commits behind head on main.

❗ Current head 73e3faa differs from pull request most recent head 9137f09. Consider uploading reports for the commit 9137f09 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1522   +/-   ##
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  Coverage   95.81%   95.81%           
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  Files         166      166           
  Lines        7648     7648           
=======================================
  Hits         7328     7328           
  Misses        320      320           

Flag	Coverage Δ
unittests	95.81% <ø> (ø)

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[felixdittrich92]

Extended with more configuration options: (which was planned for a follow up PR 😅)

Also improved tests with a small tolerance for model updates (should not change much in the future so response mocks are fine)
Closses: #1537 also

[felixdittrich92]

Fixed CI (which was green before but hasn't run any test 😅)

[felixdittrich92]

CC @eudoxos

[odulcy-mindee]

Awesome works here, thank you Felix !