[feat] Implement OP_NIP opcode

[b-j-roberts]

Implement the OP_NIP opcode using the opcodeNip reference implementation from btcd

This will include implementing a version of NipN from btcd on the Shinigami stack object.

References

Guide on how to add an opcode in shinigami

[Iwueseiter]

Hi @b-j-roberts can I work on this?

[onlydustapp[bot]]

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

[Gift-Naomi]

@b-j-roberts How about I work on this issue since @Iwueseiter has been assigned on another?

[b-j-roberts]

Yes, nice catch @Gift-Naomi . I'll assign you to this one! Let me know if you have questions!

[onlydustapp[bot]]

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