Refactor state.rs to implement avalanche-types

[morrisettathena]

Currently, state.rs uses its own types and logic, which conflicts with how rpcchain interacts with objects. state.rs should implement types from avalanche-rust

ref:
https://github.com/ava-labs/mini-kvvm-rs/blob/mini-kvvm-logic/mini-kvvm/src/state.rs
https://github.com/ava-labs/avalanche-rust

[hexfusion]

Closed via #49