Add Registry to abstract serializing and deserialzing xml into kml objects #1149

Job	Run time
cpython (3.8)	14s
cpython-lxml (3.8)	14s
cpython (3.9)	17s
cpython (3.10)	14s
cpython-lxml (3.9)	16s
cpython (3.11)	13s
cpython-lxml (3.10)	15s
cpython (3.12)	14s
cpython-lxml (3.11)	17s
cpython (3.13-dev)	24s
cpython-lxml (3.12)	14s
static-tests (3.12)	23s
pypy (pypy-3.8)	35s
pypy (pypy-3.9)	31s
pypy (pypy-3.10)	32s
Build and publish to PyPI and TestPyPI	0s
	4m 53s

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