feat: implement OP_NIP opcode

[Gift-Naomi]

• [x] Resolves #58
• [x] follows contribution guide
• [x] code change includes tests

This PR implements OP_NIP opcode

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Name	Status	Preview	Comments	Updated (UTC)
shinigami	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 6, 2024 1:53am