feat(metagen): python metagen client file upload

[luckasRanarison]

• Closes MET-769

Migration notes

---

• The change comes with new or modified tests
• Hard-to-understand functions have explanatory comments
• End-user documentation is updated to reflect the change

[linear]

MET-629 (client) add support for file uploads

MET-769 Add file upload support for Python metagen client

[luckasRanarison]

My bad, I set the branch name to 629 instead of 769...

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.68%. Comparing base (2fbb49a) to head (09c60e1).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #931   +/-   ##
=======================================
  Coverage   77.68%   77.68%           
=======================================
  Files         149      149           
  Lines       18500    18500           
  Branches     1795     1796    +1     
=======================================
  Hits        14372    14372           
  Misses       4105     4105           
  Partials       23       23           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.