Proposal to add EIP-3860 to Shanghai

[axic]

This is an early indication to seek inclusion of EIP-3860 (Limit and meter initcode) into Shanghai.

[holgerd77]

Dropping the URL here for convenience: EIP-3860

[timbeiko]

On ACD131 we decided to move this EIP to CFI for Shanghai. Closing this issue for now. We can reopen if, for whatever reasons, issues arise about the EIP's inclusion in the upgrade.