feat: Refactor opcodes, Added Error Handling, and bitcoin-core tests

[b-j-roberts]

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

Refactor opcodes and error handling. Setup basic testing bash script to use bitcoin-core script_tests.json

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Name	Status	Preview	Comments	Updated (UTC)
shinigami	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 4, 2024 0:41am