[Assets] Implement `pallet-assets-holder` #13029

Job	Run time
check-dependency-rules	10s
check-fail-ci	13s
check-markdown	21s
check-workspace	20s
preflight / preflight	46s
preflight / ci-versions	1m 6s
check-rust-feature-propagation	2m 15s
check-toml-format	1m 15s
check-umbrella	2m 33s
fmt	1m 24s
test-rust-features	2m 14s
All quick checks passed	1s
	12m 38s

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