Getting this into a Nixpkgs and adding flake.nix?

We've been using esplora as a backend for Fedimint testing. We've been running it as an ad-hoc package derivation, but I'd love to get off an extra nixpkgs fork and so on.

Here is the commit I'd like to submit to nixpkgs:

https://github.com/dpc/nixpkgs/commit/ab43e3369a231d00b06ec3a2e091a995170e26d4

As you can see I rename the package and a binary so it doesn't conflict with the existing `electrs`. I think sharing names with a fork is a mistake.

Anyway, please let me know if you're fine with this, and maybe you could consider making a tagged release so it all looks a bit "clean and polished" to Nixpkgs maintainers?

Also, would you be interested in adding a `flake.nix` to this repo, so people could just import it directly in their own flakes?