Added cssChoices option

[dzhuang]

Summary

Allow defined which FontAwesome CSS/SCSS components to be included in the generated results.

Proposed changes

This PR brings the following changes:

• Add cssChoices option

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Testing

• I have added or updated tests that prove my fix is effective or that my feature works (if applicable)
  • Unit test

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Checklist

• I have added corresponding labels to this PR (like bug, enhancement...);
• My commits follow the Conventional Commits 1.0 Guidelines;
• My code follows the style guidelines of this project;
• I have performed a self-review of my own code;
• I have mapped technical debts found on my changes;
• I have made changes to the documentation (if applicable);
• My changes generate no new warnings or errors;