Change VerificationFlags to hold a list ChainID->bool

[lumtis]

Describe the Issue
Context: #2071 (comment)

The fact if a consensus is supported in the header proof system is a static info, either it is implemented or not.

The dynamic verification flag should map enabled chains with chain IDs

Expected Outcome
Change the VerificationFlags object:

VerificationFlags {
  EnabledChains {
    ChainID int64
    Enabled bool
  }
}