Box universal import linter

[radbasa]

Changes

• Closes #532
• Adds a box_universal_import_linter()
• Adds the linter to the .lintr template
• Adds documentation

How to test

1. Unit tests for box_universal_import_linter() exist
2. Locally install rhino, version should be 1.7.0.9001, initialize a new rhino application then proceed to declare box imports.
3. rhino::lint_r() should find and point to all package[...] and path/to/file[...] imports.
4. Or, with an existing rhino app, add box_universal_import_linter = rhino::box_universal_import_linter() to .lintr.
5. rhino::lint_r() should find and point to all package[...] and path/to/file[...] imports.

[codecov-commenter]

Codecov Report

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

Comparison is base (7d3662f) 17.73% compared to head (ec2ae8b) 20.85%.

:exclamation: Current head ec2ae8b differs from pull request most recent head 58fe353. Consider uploading reports for the commit 58fe353 to get more accurate results

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #555 +/- ## ========================================== + Coverage 17.73% 20.85% +3.11% ========================================== Files 9 10 +1 Lines 406 422 +16 ========================================== + Hits 72 88 +16 Misses 334 334 ```

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