`KZG10::open` and friends visibility

[skaunov]

Summary

Streamline visibility in mod kzg: currently it offers entities which can be obtained only from other modules which is confusing.

Problem Definition

fn open... are pub(crate) and it seems like it's the only way to get Proof in kzg10; of course, it is used in other modules, but it makes disentangling that thing quite confusing.

Proposal

Either pub those functions from kzg, either pub use entities from kzg in modules where they can actually be obtained and pub(crate) them in kzg.

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[Pratyush]

Thanks for noticing this papercut! Making the methods pub would be fine; would you like to make a PR?

[skaunov]

Yep! Just wasn't sure which path was better, now that's clear.