Fix/abstract chain

[Oxbobby]

Goal: make the abstract chain work

Problems:

• blocks in abstract are returned without a signature, causing ethers to revert with a "missing r" parameter
• txn.origin during eth_call is always 0, causing our simulation/estimation to revert with incorrect spoof

Solutions:

• implement a fetchRawBlock for abstract only that fetches the block by doing directly a "eth_getBlockByNumber"
• use executeBySender() instead of execute() during estimations/simulations for the abstract chain only by state overriding the balance getter to have privileges

[Oxbobby]

/review

[github-actions]

Preparing review...