feat!: Make route handlers functional decorators #3556

Job	Run time
mypy	1m 16s
validate	12s
pyright	56s
slotscheck	38s
Test server integration (uvicorn<0.27.0)	55s
Test server integration (uvicorn>=0.27.0)	55s
Test Minimal Application with Base Dependencies	33s
Test Minimal Pydantic 1 application	45s
test-platform-compat	0s
test (3.10) / test	1m 36s
test (3.11) / test	1m 26s
test (3.12) / test	2m 46s
test (3.8) / test	2m 14s
test (3.9) / test	1m 37s
build-docs	2m 53s
upload-test-coverage	18s
codeql	3m 14s
sonar	1m 7s
	23m 21s

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