feat: add commit-boost support

[ltitanb]

Initial support for Commit-Boost, adding for now only the PBS module (equivalent to MEV-Boost).

Note that this depends on this PR being merged and released.

There is sometimes some ambiguity between mev-boost (go client) and mev-boost (protocol via the Builder API), so to disambiguate within commit boost we call the PBS module the sidecar implementing the mev-boost protocol. Here I followed the existing convention as much as possible even if it sounds somewhat repetitive at times (commit-boost-mev-boost).

EDIT: the blocking PR is now merged and released in 0.3.0

[ltitanb]

when tested locally the logs will look like this