feat(configuration): add default tx signers option #149
Description
- we reuse all the same tx signers across networks (e.g. processor tx signer will be same on ethereum, moonbeam, evmos, and milkomeda); even though signer is the same address, we specify the same key 3x
- want to add a feature to encode this into env var
- e.g.
DEFAULT_TRANSACTIONSIGNERS_REPLICA_KEY=0x... - This would use same tx signer for all networks