Function estimateMultisigP2SH_P2WSHTransactionVSize

Estimate the transaction virtual size (vsize) when spending inputs from the same multisig P2SH-P2WSH address.

According to Bitcoin Optech calculator:

• P2SH-P2WSH has the same witness structure as P2WSH
• Base input size is different: includes P2SH redeem script (22 bytes) instead of empty script
• Weight calculation: (baseSize * 3 + witnessSize) / 4