Switch from cryptonite library to crypton

[erikd]

The former library is deprecated in favor of the latter which is a drop in replacement.

Some of cardano-api's dependencies might still depend on the former but they will all be fixed eventually.

Changelog

- description: |
    Switch from cryptonite library to crypton
  type:
    - compatible     # the API has not changed

Context

How to trust this PR

Checklist

• [x] Commit sequence broadly makes sense and commits have useful messages
• [ ] New tests are added if needed and existing tests are updated. See Running tests for more details
• [ ] Self-reviewed the diff

[erikd]

Just discovered something wrong with this. Will look tomorrow.

[erikd]

This can't be done/fixed until the lower level libs (cardano-crypto, plutus, ledger etc) have been updated.

Closing this.