feat: add user facing `SubscriptionParams` type #742

Job	Run time
Launch all cargo linters to check condition of the code	1m 38s
Check Cargo crate dependencies (advisories)	21s
Check Cargo crate dependencies (bans licenses sources)	28s
Check if `no_std` target compiles as expected	54s
Check if Web Assembly target compiles as expected	52s
Validations	1s
	4m 14s

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