chore: move FB state to config

[danyalprout]

Description

Migrate the FB State to the FB config so it can be accessed by other extensions that need it.

[cb-heimdall]

✅ Heimdall Review Status

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[danyalprout]

Should simplify the setup in #387

[niran]

So basically, we had a start() already to kick off the state processor that needs the provider in the first place, so just initialize at start instead of a separate initialization phase. Metering doesn't need to worry about starting the state processor since that's flashblocks' job, so it can just hold on to an Arc<FlashblocksState> and get the pending blocks whenever it needs to. Much better!