Import sorting and fix message changes requested in #263

[Pabsthegreat]

Modifying a linting rule: ImportSort

This pull request adds a new rule to wdl-lint.

• Rule Name: ImportSort

This PR addresses the changes requested in the issue #263, ensures that import statements in WDL files are sorted lexicographically and given to user when 'import not sorted error' occurs, to improve readability and maintain consistency.

Changes in this PR:

• Implemented ImportSortRule to check import sorting and flag errors if imports are out of order.
• Added a diagnostic to suggest correct order when sorting violations occur.
• Prevented inline comments within import statements, as per best practices.

Checklist Before Merging:

• cargo check and cargo test works

Rule-Specific Checklist:

• I was not able to run checks as i was unable to get a clean 'cargo test --all-features' output, I request one of the members to review the changes and attempt compiling. 'cargo check', 'cargo test' run alright.

Additional Notes:

This PR introduces a lint rule to ensure import consistency in WDL workflows. Future improvements could include customizable sorting preferences if needed by users.

[Pabsthegreat]

@claymcleod @peterhuene could you review this and check if it works? Thanks!