Allow for customising defaulters

[baitcode]

Feature request to allow for customisation of defaulters.

In my project I want to be able to use custom defaulter implementation that does not use node HTTP API but rather connect to starknet state database directly.

API change proposal:

starknet_devnet_core::starknet::defaulter::StarknetDefaulter::register_defaulter(
    "sqlite",
    SQLiteStateReader::new_sqlite_state_reader,
)

SQLiteStateReader should implement OriginReader trait

pub trait OriginReader: std::fmt::Debug + Send + Sync {
    fn get_storage_at(
        &self,
        contract_address: ContractAddress,
        key: StorageKey,
    ) -> StateResult<Felt>;
    fn get_nonce_at(&self, contract_address: ContractAddress) -> StateResult<Nonce>;
    fn get_compiled_class(&self, class_hash: ClassHash) -> StateResult<RunnableCompiledClass>;
    fn get_class_hash_at(&self, contract_address: ContractAddress) -> StateResult<ClassHash>;
}