fix(konsistent): fix importFrom predicate to distinguish between exact vs sub match imports

[felixarntz]

Pull Request Description

Fixes importFrom so package roots only match exact module specifiers by default, while explicit trailing /* handles subpath checks. It also allows configs to require or forbid multiple import sources in one predicate.

Relevant technical choices

• Changed importFrom matching to exact equality unless the configured source ends in /*.
• Added string[] support in config schemas, placeholder validation, and mustNot item-level checks.
• Updated unit tests, e2e fixtures, generated schemas, and docs for exact, wildcard, and array behavior.

Checklist

• All commits are signed (PRs with unsigned commits cannot be merged)
• Tests have been added / updated
• A changeset has been added (run pnpm changeset in the project root if package files were modified)
• I have reviewed this pull request (self-review)