feat(node_framework): Support Eth Watch in the framework

[AnastasiiaVashchuk]

What ❔

• Small change in the EthWatch component. Now Eth Watch 's pool field is used instead of ConnectionPool passed in the Eth Watch's run() method.
• Adds Eth Watch implementation, i. e. EthWatchLayer and EthWatchTask, in the same way it was done for StateKeeper here.

Current "external" point of view for the framework(the only thing changed is that we add .add_eth_watch_layer()? after .add_state_keeper_layer()?):

fn main() -> anyhow::Result<()> {
    #[allow(deprecated)] // TODO (QIT-21): Use centralized configuration approach.
    let log_format = vlog::log_format_from_env();
    let _guard = vlog::ObservabilityBuilder::new()
        .with_log_format(log_format)
        .build();

    MainNodeBuilder::new()
        .add_pools_layer()?
        .add_fee_input_layer()?
        .add_object_store_layer()?
        .add_metadata_calculator_layer()?
        .add_state_keeper_layer()?
        .add_eth_watch_layer()?
        .add_healthcheck_layer()?
        .build()
        .run()?;

    Ok(())
}

[popzxc]

Looks pretty good!