Update EIP-155: Adding ChainID 0 to increase awareness for EOA registration

[GriffGreen]

See https://github.com/ChainAgnostic/namespaces/blob/main/eip155/caip10.md for context

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[eth-bot]

File EIPS/eip-155.md

Requires 1 more reviewers from @vbuterin
Requires 3 more reviewers from @axic, @g11tech, @gcolvin, @lightclient, @SamWilsn, @xinbenlv

[github-actions]

The commit 0bce759 (as a parent of 05c8b9e) contains errors.
Please inspect the Run Summary for details.

[lightclient]

Chain id 0 isn't technically a thing. If you were to fill CHAIN_ID in with 0 in this EIP the tx would be rejected because no networks have a chain id of 0 (actual v values ends up being 35 or 36 depending on parity).