v0.9.5 - Serve l2geth as readonly mode

This release is to support the readonly mode in l2geth. In the readonly mode, l2geth can serve data reading without data transport layer and block any transactions.

What's Changed

• Add readonly mode by @boyuan-chen in https://github.com/bobanetwork/boba/pull/1355
• Bump up node version to v18 by @boyuan-chen in https://github.com/bobanetwork/boba/pull/1356

Full Changelog: bobanetwork/boba@v0.9.4...v0.9.5