New Predicate: matching on ScriptPubKey of prevouts

[MicaiahReid]

It would be nice for users to be able to match on the ScriptPubKey field of a transaction input's prevout field. This will allow them to create predicates that notify when a certain address sends a transaction.

Some context:

We already download the full transaction input data from the bitcoin RPC, so we just need to augment our types here and here, create a new input predicate, and match with the predicate with a patter similar to this

[ImCitizen13]

That would be great to add as all the pieces are in place

[MicaiahReid]

@ImCitizen13 Would you be interested in taking this on?

We're currently focusing on some reliability work for the tool, so community involvement on new features would definitely be welcome!

[ImCitizen13]

I'm not too familiar with rust, but I'll definitely give it a try and let you know of the progress.
I'll have some questions if you can help along the way. 🙏🙏

[MicaiahReid]

@ImCitizen13 Yes of course! Feel free to ask questions here or on Discord.

And thanks for contributing!