fix: convert blob.subscription into Hamt #1431

Job	Run time
license / License checks	13s
contracts-prettier / prettier	1m 10s
build / Build IPC	11m 40s
contracts-sast / Solhint check	1m 11s
contracts-sast / Slither check	1m 46s
contracts-storage / Storage layout check	2m 31s
contracts-deployment-test / build	1m 57s
contracts-test / tests	3m 37s
extras / Extras: Axelar token	1m 20s
unit-tests / run	12m 45s
e2e-tests / run	5m 31s
docker-publish	0s
	43m 41s

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