feat(ui): add Mosaic Item component #31520

Job	Run time
Check Permissions	12s
Build Packages	1m 7s
Formatting \| Dedupe \| Changeset	1m 14s
Bundle size	0s
Integration Tests (${{ matrix.test-name }}, ${{ matrix.test-project }}${{ ((matrix.next-version && format(', {0}', matrix.next-version)) \|\| '') }})	0s
Static analysis	0s
Publish with pkg-pr-new	0s
Unit Tests (${{ matrix.filter-label }})	0s
	2m 33s

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