Tests

374 add hypothesis tests for kml, containers and features #1642

Job	Run time
Build & inspect our package.	20s
cpython (3.8)	14s
cpython (3.9)	15s
cpython (3.10)	14s
cpython (3.11)	17s
cpython (3.12)	19s
cpython (3.13)	22s
cpython (3.14-dev)	25s
doctest-lxml (3.12)	34s
cpython-lxml (3.8)	3m 21s
cpython-lxml (3.9)	3m 27s
static-tests (3.12)	35s
cpython-lxml (3.10)	3m 21s
pypy (pypy-3.8)	40s
pypy (pypy-3.9)	32s
cpython-lxml (3.11)	3m 42s
pypy (pypy-3.10)	35s
cpython-lxml (3.12)	4m 49s
cpython-lxml (3.13)	5m 8s
Test install on TestPyPI	0s
Publish to PyPI on push to main	0s
	29m 10s

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