jackson: performance improvements - static xmlutil and XmlMapper #2628

Job	Run time
build and analyse (11, ubuntu-latest)	46s
build and analyse (11, macos-latest)	1m 2s
build and analyse (11, windows-latest)	44s
build and analyse (17, ubuntu-latest)	52s
build and analyse (17, macos-latest)	58s
build and analyse (17, windows-latest)	49s
build and analyse (21, ubuntu-latest)	56s
build and analyse (21, macos-latest)	1m 3s
build and analyse (21, windows-latest)	55s
build and analyse (22, ubuntu-latest)	54s
build and analyse (22, macos-latest)	1m 5s
build and analyse (22, windows-latest)	43s
build and analyse (23, ubuntu-latest)	50s
build and analyse (23, macos-latest)	1m 3s
build and analyse (23, windows-latest)	47s
	13m 27s

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