[feat] Implement OP_1NEGATE opcode

[b-j-roberts]

Implement the OP_1NEGATE opcode using the opcode1Negate reference implementation from btcd

References

Guide on how to add an opcode in shinigami

[mubarak23]

@b-j-roberts kindly assign this issue to me

[onlydustapp[bot]]

Hey @mubarak23! Thanks for showing interest. We've created an application for you to contribute to shinigami. Go check it out on OnlyDust!

[mubarak23]

@b-j-roberts am getting the following error String literals can only include ASCII characters. on this

let expected_stack = array!["\x81"];

\x81 is a hexadecimal representation of a character with the code 129, which is not an ASCII character.