chore: Integrate T5 in FLUX

[aturker-synnada]

Description

Closes #211.

What is Changed

• FLUX now uses Mithril T5 as text embedder.

Checklist:

• Tests that cover the code added.
• Corresponding changes documented.
• All tests passed.
• The code linted and styled (pre-commit run --all-files has passed).

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.32%. Comparing base (28e954c) to head (19eb81d).
Report is 3 commits behind head on main.

@@            Coverage Diff             @@
##             main     #212      +/-   ##
==========================================
- Coverage   89.33%   89.32%   -0.01%     
==========================================
  Files          68       68              
  Lines       16583    16587       +4     
==========================================
+ Hits        14814    14816       +2     
- Misses       1769     1771       +2     

see 11 files with indirect coverage changes