chore: Improve Governancecodebase

[TAdev0]

Hey @moodysalem , while reading the code of the Governance contracts, I decided to push this small PR without any functionality modification:

• remove unnecessary (imported by default with prelude 2023_11) and unused imports
• reorganize imports where needed
• remove unnecessary pub(crate) in multiple places
• increase consistency in comments (full sentence with point at the end when commenting interfaces, etc)
• use array macro everywhere to instantiate new arrays
• Correct a few typos

[moodysalem]

Personally not a big fan of code changes that are purely stylistic and aren't enforced by scarb fmt, a lot of this isn't objectively more readable, and it was my stylistic preference to use {} for imports even if it's just one

That said cleaning up comments I can get behind

[TAdev0]

just left comments improvements.
also left array macros as you use them in various places and there was just like 4 remaining instantiation with arrayTrait::new() .
same for line skipped, i did it where it was supposed to be done given the style of the rest (skip line before returning a value as an expression for example)