Allow the L1 gas price to be fetched from either the sequencer or a L1 provider based on the config `--l1-gas-price-backend` as well as overriding the config by using a query param. Valid values are `l1` or `l2` and it defaults to `l1`
- 390fd8a6: Allow the L1 gas price to be fetched from either the sequencer or a L1 provider based on the config `--l1-gas-price-backend` as well as overriding the config by using a query param. Valid values are `l1` or `l2` and it defaults to `l1`
- 049200f4: removed unused functions from core-utils