refactor: make ChainSpec associated type on EvmWiring

[Wodann]

This PR proposes a separation between the EvmWiring and ChainSpec such that the associated types of a ChainSpec can be used without the ExternalContext and Database that are only required for the Evm.

This allows re-usage of chain specs for other use cases.

[rakita]

Something like this is probably possible, if you need to split the trait it can be done outside of Revm:

mod temp {

    pub trait ChainSpec {}

    pub trait ExtCtx {}

    pub trait Database {}

    pub trait PresentWiring {
        /// Chain specification type.
        type ChainSpec: ChainSpec;

        /// External context type
        type ExtCtx: Sized;

        /// Database type.
        type Database: Database;
    }

    pub trait NewChain {
        type ChainSpec: ChainSpec;
        type ExtCtx: ExtCtx;
    }

    pub trait NewWiring {
        type NC: NewChain;
        type Database: Database;
    }

    impl<T: NewWiring> PresentWiring for T {
        type ChainSpec = <<Self as NewWiring>::NC as NewChain>::ChainSpec;
        type ExtCtx = <<Self as NewWiring>::NC as NewChain>::ExtCtx;
        type Database = <Self as NewWiring>::Database;
    }
}

[Wodann]

Something like this is probably possible, if you need to split the trait it can be done outside of Revm:

That is possible indeed.

I was hoping to avoid redefinitions of traits, but we can define our own ChainSpec type instead and reimplement the REVM EvmWiring using that. Thanks!

[rakita]

Closing this, if there are more things about integration lets talk about it in different issue.