feat: add parent to XMLElement #228

Job	Run time
Linux Test (swift:5.8-focal, true)	32s
Linux Test (swift:5.8-jammy, true)	30s
Mac Test (macOS, SWXMLHash OSX, build-for-testing test-without-building)	12s
Linux Test (swift:5.8-rhel-ubi9, true)	31s
Mac Test (iOS, SWXMLHash iOS, build-for-testing test-without-building, -sdk iphonesimulator -dest...	12s
Linux Test (swift:5.9-focal, true)	29s
Linux Test (swift:5.9-jammy, true)	30s
Mac Test (tvOS, SWXMLHash tvOS, -sdk appletvsimulator -destination "name=Apple TV")	10s
Linux Test (swift:5.9-rhel-ubi9, true)	31s
Mac Test (watchOS, SWXMLHash watchOS, build-for-testing test-without-building, -sdk watchsimulator)	10s
Linux Test (swift:5.10-focal, true)	26s
Linux Test (swift:5.10-jammy, true)	30s
Linux Test (swift:5.10-rhel-ubi9, true)	30s
Windows Test (swift-5.10-release, 5.10-RELEASE, true)	1m 17s
Linux Test (swift:6.0-focal, true)	2m 9s
Windows Test (swift-6.0-release, 6.0-RELEASE, true)	6m 6s
Linux Test (swift:6.0-jammy, true)	2m 13s
Linux Test (swift:6.0-rhel-ubi9, true)	2m 10s
	19m 8s

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