feat: implement `HTMX` plugin using `litestar-htmx` #4256

Job	Run time
mypy	1m 15s
pyright	1m 0s
slotscheck	32s
Test server integration (uvicorn<0.27.0)	52s
Test server integration (uvicorn>=0.27.0)	52s
Test Minimal Application with Base Dependencies	30s
Test Minimal Pydantic 1 application	42s
test-platform-compat	0s
validate	13s
test (3.10) / test	2m 6s
test (3.11) / test	1m 47s
test (3.12) / test	3m 31s
test (3.8) / test	3m 2s
test (3.9) / test	2m 9s
build-docs	2m 53s
upload-test-coverage	16s
codeql	2m 29s
sonar	1m 8s
	25m 17s

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