feat: additional validations

Validate that:

1. Non-constant/immutable variables use camelCase
2. Functions in the src and script directories are camelCase
3. Contract names are PascalCase
4. Imports are sorted by forge-std -> test -> script -> src, then alphabetically by path within each
5. Imports use named import syntax
6. Named import items are sorted alphabetically
7. Only apply script checks to .s.sol files in the script directory — done in Bug fixes, bring back line numbers #9
8. Check for unused imports
9. In test contracts, all non function test* methods are internal or private

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