Add rust-bitcoin utility functions

[cygnet3]

No description provided.

[Sosthene00]

The commits itself looks fine, but my concern is more about the trade-off of adding a (big) dependency that breaks all the time for the added convenience, compared to the original approach of keeping it out of rust-silentpayment and let downstream consumers (like sp-backend) deal with it. I think it's a bit premature now, and maybe we can talk about it again when sp-backend and donation wallet stabilize.

[pythcoiner]

but my concern is more about the trade-off of adding a (big) dependency that breaks all the time for the added convenience,

i'm wondering if it is a way to supply util as macros instead functions, where the consumer can supply it's own bitcoin dependency?

[cygnet3]

That sounds like it could work indeed, I'll check it out when I have the time

[Sosthene00]

That sounds great, but needs more investigation, I'm not super confortable with writing macros atm