feat(runner): Generic Extensions

[refcell]

Description

Refactored the runner to make extensions type-driven using newly created extension traits built from the BaseNodeConfig. Extensions can now be installed via a generic method: install_ext::<T>() (in the code snippet below we show this API change). In the node binary entrypoint, we now install extensions in this way - programmatically.

// bin/node/src/main.rs
cli.run(|builder, args| async move {
    let mut runner = BaseNodeRunner::new(args);
    runner.install_ext::<FlashblocksCanonExtension>()?;
    runner.install_ext::<TransactionTracingExtension>()?;
    runner.install_ext::<BaseRpcExtension>()?;
    runner.run(builder).await
})?;

To allow the flashblocks state to be shared through a OnceCell, we moved this instantiation into the BaseNodeConfig, so this type can be cloned by the extensions during construction. This is a temporary solution which should be improved down the road.

[cb-heimdall]

✅ Heimdall Review Status

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Reviews	✅ 1/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 0 Sum 1

[haardikk21]

this is pretty cool