feat(modal): add container option to append modals to custom elements #1107

Job	Run time
one_run	3s
install	19s
build	1m 4s
linting	2m 44s
unit_tests_with_coverage	0s
firebase_preview	0s
e2e smoke (${{ matrix.shard }}/${{ strategy.job-total }})	0s
e2e full	0s
	4m 10s

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