feat(checker): add xz checker #1181

Job	Run time
Documentation	32s
Long tests on Python 3.10	11m 46s
Long tests on Python 3.10 (scanners)	19m 6s
Linux tests (3.9)	1m 11s
Linux tests (3.11)	1m 43s
Linux tests (3.12)	1m 42s
Linux tests (3.13)	57s
Tests that may fail due to network or HTML	1m 10s
Long tests on Python 3.10 (language parsers)	5m 13s
Long tests on Python 3.10 (synchronous)	25m 23s
Windows long tests	1h 29m 1s
	2h 37m 44s

Provide feedback