Improve jsonrpsee RpcModule ergonomics

[elmattic]

Issue summary

This is a follow-up of #3978.

We had to build an Arc<RPCState> to create two jsonrpsee's RPC modules in Forest.

However, a RpcModule internally creates an Arc.
This results in having to use Arc<Arc<State>> at many places, but that would not be strictly necessary if we could create an RPC module from an Arc.

Task summary

• Add the new constructor in jsonrpsee crate
• Get the PR approved
• Remove one Arc level from our Data type alias

Other information and links

https://docs.rs/jsonrpsee-core/0.21.0/src/jsonrpsee_core/server/rpc_module.rs.html#470

[aatifsyed]

paritytech/jsonrpsee#1324