feat: introduce EIP-6110 epoch and version in ChainConfig
#5953
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Motivation
This is part of the effort to implement #5366 .
Original intention was to implement changes to pubkey cache on unstable branch, and the actual EIP-6110 implementation on a separate branch. However, there is a need to have a fork gate on pubkey cache mentioned here #5937 (comment) .As such, there is a need to define the EIP-6110 fork in unstable branch.
This PR is to make as minimal change as possible to define EIP-6110 fork such that the development of fork gate on pubkey cache can continue.
Description
EIP6110_FORK_VERSION
andEIP6110_FORK_EPOCH
inChainConfig
.ChainConfig
.