Log warning on startup if chain spec contains misaligned fork epochs

[jimmygchen]

Issue Addressed

Addresses this comment: https://github.com/sigp/lighthouse/pull/4946#discussion_r1475547414

If fork epochs are not multiples of 256, sync committee period may span across forks - this is mostly fine for non-production and testing code unrelated to light client. Adding a check would be useful for identifying issues with future forks / light client testing.

Proposed Changes

Check fork epochs in the ChainSpec are aligned with the start of sync committee period, otherwise log a warning durinog startup.

[jimmygchen]

The intent was mainly for setting up expectation and giving a heads up on the configuration during testing (local devnet / testnets).

So yes, this only applies to local devnet and experiments, and we should never see this on a production network.

[jimmygchen]

@mergify queue

[mergify[bot]]

queue

✅ The pull request has been merged automatically

The pull request has been merged automatically at 4c7277c6461288bd01a5e9b966422e176b866e91