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BCH May 2023 Upgrade: Enforce tx nVersion in consensus rather than standardness

Calin Culianu requested to merge cculianu/bitcoin-cash-node:restrict_version_in_consensus_upgrade9 into master

Summary

This implements the following CHIP: https://gitlab.com/bitcoin.cash/chips/-/blob/3b0e5d55e1e139046794e850287b7acb795f4e66/CHIP-2021-01-Restrict%20Transaction%20Versions.md See discussion here: https://bitcoincashresearch.org/t/restrict-transaction-version-numbers/173

Right now, standard relay rules restrict tx.nVersion to either 1 or 2. After May 2023 upgrade, we will also restrict tx.nVersion to be either 1 or 2 as a consensus rule.

Test Plan

  • ninja all check-all

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