feat(core): Streaming multipart parser

[provinzkraut]

Add a streaming multipart parser via the multipart lib.

This gives us:

• Ability to stream large / larger-than-memory file uploads
• Better / more correct edge case handling
• Still good performance

[codecov]

Codecov Report

Attention: Patch coverage is 95.12195% with 2 lines in your changes missing coverage. Please review.

Project coverage is 98.40%. Comparing base (444d594) to head (76cf74f).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
litestar/_multipart.py	94.73%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3872      +/-   ##
==========================================
- Coverage   98.41%   98.40%   -0.02%     
==========================================
  Files         344      344              
  Lines       15478    15467      -11     
  Branches     1702     1701       -1     
==========================================
- Hits        15233    15220      -13     
- Misses        115      118       +3     
+ Partials      130      129       -1     

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[defnull]

I couldn't wait till tomorrow with the review ;)

[euri10]

amazing addition

[github-actions]

Documentation preview will be available shortly at https://litestar-org.github.io/litestar-docs-preview/3872

[defnull]

Multipart v1.2.0 is released now :)
Changelog: https://multipart.readthedocs.io/en/latest/changelog.html

[sonarqubecloud]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud