feat: Add testnet4 chain support (recreated) #2318
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This PR is a recreation of the previous PR because I incidentally dropped a brunch and the PR was closed automatically.
Description
This PR adds support of the Bitcoin testnet version 4 chain (testnet3 is in a way of deprecation).
Reference: https://bips.dev/94/
Testnet4 genesis block: https://mempool.space/testnet4/block/00000000da84f2bafbbc53dee25a72ae507ff4914b867c565be350b0da8bf043