feat(contracts-periphery): create Faucet contract

Use strings package to check for a prefix

feat(proxyd): moar consensus metrics

feat(proxyd): add limit to consensus block lag

feat(migration): Mimic `xdm.baseGas` in `migrate.go`

feat(pops): Bond Manager

feat(ctb): SafeCall send function to call with zero calldata bytes

op-node: Don't invoke p2p unsafe sync for old L2 blocks

feat(sdk): Update `message-utils` to mimic `MigrateWithdrawalGasLimit`

fix(proxyd): eth2 block tags {safe, finalized} should be valid tag values and avoid cache

refactor(proxyd): prevent direct access to backend state struct in consensus poller

Add 4-26 transaction delays post-mortem

ci: Update tag regex to recognize proxyd

message-utils: use BigNumber