Re-export `NetworkNotePricer`

[ricomateo]

From 0xMiden/faucet#300 (comment)

Re-exporting the NetworkNotePricer struct would allow the faucet to drop the miden-tx dependency.

[huklaa]

I’m working on this. I’ll keep the scope to the public re-export needed by the faucet, add the smallest appropriate API/compile coverage if the crate structure supports it, and perform a final overlap check before submitting.

[juan518munoz]

I have bundled this change in #2475