feat(docs): update readme

fix(ctb): resolve compiler warning

Resolves a small compiler warning. Nothing significant.

op-e2e: flip-flop test

This solves Issue #3709

op-e2e: test orphan L1 block with batch and replay batch + keep engine fc state in sync [bedrock]

ci: Codecov badges and ignore some files

predeploys: add L2 `ProxyAdmin`

fix(l2g): bug in state dumper

We need an instance of the `ProxyAdmin` on L2 to manage each
of the other predeploys. This change ranges across the entire
codebase and the spec is updated with the new predeploy.

feat(ctb): trie updates for Bedrock

ci-builder: update geth version

Merkle Trie updates for bedrock.

ctb: Remove MessagePassedExtension1 event

Fixes a bug in the state dumper. os.OpenFile was using the wrong file
descriptors and that would break l2geth.