Provide an API to query the patterns matching a pattern

[nielstron]

Describe your idea, in simple words.

I want an endpoint that I can pass a pattern and then get back a list of patterns that kupo already tracks and match this pattern.

Why is it a good idea?

I query many different addresses in my application. It might happen that one of the addresses I am interested about is not tracked by kupo, in that case I want to fall back to a different endpoint. Rather than querying all patterns from kupo and then comparing them inside my application, it would be simpler to provide such a functionality inside kupo.

Are you willing to work on it yourself?

Yes, however I have trouble testing this. There is a prototypical implementation of this here: master...nielstron:kupo:master
I however have not been able to test if it works as intended (or even compiles)