feat: overhaul RPC server

[zivkovicmilos]

Description

This PR overhauls the underlying RPC server implementation in Tendermint2, to optimize significantly on request / response processing.

To the user, the interaction with the node's RPC should stay the same, it's just the internal processing that is changed.

//TODO description

⚠️ HEAVY WIP ⚠️

[Gno2D2]

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