chore: add tests to check the theme config

[halvaradop]

Description

This pull request introduces tests for the @halvaradop/tailwindcss-animations package to ensure the integrity of the theme configuration. The following changes have been made:

• Added tests to verify that the values provided in the theme config are loaded correctly.
• Created a new file utils.test.ts, which contains tests for the utility functions within the package.

Checklist

• Added documentation.
• The changes do not generate any warnings.
• I have performed a self-review of my own code
• All tests have been added and pass successfully

Notes

[github-actions]

Thank you, @halvaradop, for your contribution to halvaradop/tailwindcss-utilities.

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