Added some more data fields for block collector

[mw2000]

A PR for adding more data fields into the block creator. I think it would be beneficial if we had the base_fee_per_gas, the total gas, timestamp, and the extra_data of the block being collected.

Open question: I've set the base fee to be 0 for blocks previous to London. Maybe there's a cleaner way to do this.

P.S.: I'm new to rust and the library, so I wanted to draft a small PR as I learn and explore Artemis further.

[pistomat]

If we are adding more data fields, is returning the whole block as ethers::types::Block<TxHash> an overkill?

[FrankieIsLost]

Agree with @pistomat, let's make this a Collector<ethers::types::Block<TxHash>> instead of Collector<NewBlock> to avoid having to do manual destructuring

[mw2000]

Okay, added block as a subitem of NewBlock. block is of type Block<TxHash> and modified some stuff that would change due to this.

[mw2000]

@FrankieIsLost was revisiting some old PRs, is this still merge-worthy or close?