feat(wasm-utxo): add support for utxolib signature size compatibility

Add utxolibCompat option to Dimensions to match @bitgo/unspents vSize
calculations. This allows exact fee estimation compatibility with the
legacy library by using 72-byte signatures instead of 73-byte max.

The implementation handles encoding differences like OP_PUSHDATA2 for
redeemScripts, which affects weight calculations and virtual sizes.

Issue: BTC-2908

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger