Use flit-core as build-system

[sscherfke]

Build functionality has been moved into flit-core which makes repackaging (e.g. for Conda or Linux distros) easier.

[codecov]

Codecov Report

Merging #5328 (b23ec72) into master (0bb8920) will decrease coverage by 11.39%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##            master    #5328       +/-   ##
============================================
- Coverage   100.00%   88.60%   -11.40%     
============================================
  Files          535      499       -36     
  Lines        13825    12887      -938     
============================================
- Hits         13825    11418     -2407     
- Misses           0     1469     +1469     

Impacted Files	Coverage Δ
docs_src/app_testing/app_b_py310/main.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/sql_databases/sql_app_py39/crud.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/sql_databases/sql_app_py39/main.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/sql_databases/sql_app_py310/crud.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/sql_databases/sql_app_py310/main.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/app_testing/app_b_py310/test_main.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/sql_databases/sql_app_py39/models.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/sql_databases_peewee/sql_app/crud.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/sql_databases_peewee/sql_app/main.py	0.00% <0.00%> (-100.00%)	⬇️
docs_src/sql_databases/sql_app_py310/models.py	0.00% <0.00%> (-100.00%)	⬇️
... and 229 more

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[github-actions]

📝 Docs preview for commit b23ec72 at: https://63106c859a6b4d3c7d7e1e37--fastapi.netlify.app

[iudeen]

The new standard of build system is using hatch. There is a PR for this already #5240