feat: deprecate `litestar.contrib.sqlalchemy` #4121

Job	Run time
mypy	1m 19s
mypy	1m 19s
slotscheck	34s
slotscheck	34s
pyright	58s
pyright	58s
Test server integration (uvicorn<0.27.0)	53s
Test server integration (uvicorn<0.27.0)	53s
Test server integration (uvicorn>=0.27.0)	52s
Test server integration (uvicorn>=0.27.0)	52s
Test Minimal Application with Base Dependencies	36s
Test Minimal Application with Base Dependencies	36s
Test Minimal Pydantic 1 application	36s
Test Minimal Pydantic 1 application	36s
test-platform-compat	0s
test-platform-compat	0s
validate	11s
validate	11s
test (3.10) / test	1m 55s
test (3.10) / test	1m 55s
test (3.11) / test	1m 48s
test (3.11) / test	1m 48s
test (3.12) / test	3m 18s
test (3.12) / test	3m 18s
test (3.8) / test	10m 14s
test (3.8) / test	2m 55s
test (3.9) / test	1m 57s
test (3.9) / test	1m 57s
build-docs	2m 47s
build-docs	2m 47s
codeql	0s
codeql	3m 10s
sonar	0s
sonar	0s
upload-test-coverage	0s
upload-test-coverage	16s
	52m 3s

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