OP_CC: A simple introspection opcode to enable cheaper consolidations

The concept of OP_CHECKCONTRACTVERIFY (CCV) offers a notable approach to achieve signatureless consolidation alongside external fee payment in blockchain transactions. By utilizing a taptree with a singular leaf, it mandates that all value must flow to output0 under the same spending public key (spk), without necessitating any signatures. This method not only simplifies the transaction process by eliminating the need for signatures but also retains the flexibility of spending the Unspent Transaction Output (UTXO) through the conventional key spend method to any chosen destination. This dual functionality underscores the potential of CCV in enhancing transaction efficiency and flexibility within the blockchain domain.