feat: implement Packet getters for HolisticLandmarker #798

Job	Run time
check-test-trigger	3s
run-tests-on-linux / build	29m 13s
run-tests-on-macos / build	36m 36s
run-tests-on-windows / build	1h 3m 29s
run-tests-on-linux / test (ubuntu-24.04, 6000.0.33f1)	3m 26s
run-tests-on-linux / test (ubuntu-24.04, 2022.3.55f1)	3m 32s
run-tests-on-linux / post-test	3s
run-tests-on-macos / test (macos-13, 6000.0.33f1, 433b0a79340b)	5m 29s
run-tests-on-macos / test (macos-13, 2022.3.55f1, 9f374180d209)	9m 51s
run-tests-on-macos / post-test	2s
run-tests-on-windows / test (windows-2019, 6000.0.33f1, 433b0a79340b)	11m 46s
run-tests-on-windows / test (windows-2019, 2022.3.55f1, 9f374180d209)	14m 9s
run-tests-on-windows / post-test	2s
	2h 57m 41s

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