P2MS in compat SegWit create transaction example

This is the same as transaction showcased in tx/multisig_create.pl example, but it uses P2SH(P2WSH) output instead of native P2WSH.

This code was used to produce testnet transaction: https://mempool.space/testnet/tx/4cb7af0ac5c964ebe2bc6aa0bcf2b96193d8cfa2fd6a77c0a5f0f3276f3c3f69