Box alphabetical imports linter.

[radbasa]

Changes

• Closes #543
• Adds box_alphabetical_imports_linter()
• Adds the linter to the .lintr template
• Adds documentation
• This linter ignores package/module/function aliases.

How to test

1. Unit tests for box_alphabetical_imports_linter() is provided.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 38.55%. Comparing base (0ff3c44) to head (9d6bf91).

:exclamation: Current head 9d6bf91 differs from pull request most recent head 7958999. Consider uploading reports for the commit 7958999 to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #544 +/- ## ========================================== + Coverage 34.11% 38.55% +4.43% ========================================== Files 10 10 Lines 554 594 +40 ========================================== + Hits 189 229 +40 Misses 365 365 ```

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