btc: add bitcoin core setup using the latest v24.0.1
the scripts are nearly identical to lnd/env.
current nakamochi nodes are running bitcoind v23. so, this also upgrades
to the latest. release notes are here:
https://github.com/bitcoin/bitcoin/blob/master/doc/release-notes/release-notes-24.0.1.md
a notable change in v24 is the "full rbf".
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