feat(jsonrpc): require `Sync` on transport params #124

Job	Run time
Build starknet-ff features	2m 18s
Build starknet-curve features	1m 33s
Build starknet-crypto-codegen features	1m 42s
Build starknet-crypto features	1m 47s
Build starknet-core features	2m 14s
Build starknet-providers features	3m 10s
Build starknet-signers features	2m 3s
Build starknet-accounts features	2m 12s
Build starknet-contract features	3m 7s
Build starknet-macros features	1m 36s
Build starknet features	3m 20s
	25m 2s

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