fix(rust/catalyst-types): Implement Display for hash wrappers

[stanislav-tkach]

Description

• Implement the Display trait for types generated by the define_hashes! macro.

Description of Changes

Blake2bHash implements Display, so it makes sense to implement this trait for derived types too. Also it is often used to print a user-friendly hash representation.

Related Pull Requests

input-output-hk/catalyst-voices#1367

Please confirm the following checks

• My code follows the style guidelines of this project
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream module

[github-actions]

✅ Test Report | ${\color{lightgreen}Pass: 279/279}$ | ${\color{red}Fail: 0/279}$ |

[bkioshn]

LGTM