Add polygon face support to MeshT #7995

Job	Run time
py-mac-arm64	3m 59s
cpp-${{ (((matrix.mode == '') && 'opt') \|\| 'dev') }}-${{ (((matrix.os == 'macos-latest-large') && 'mac-x86_64') \|\| 'mac-arm64') }}	-1s
	3m 58s

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