feat(styles): Add additional animation classes

[macandcheese]

Summary

Adding additional "left" and "right" animation classes, to support #6919 and other future needs.

• Adds calcite-animate__in-left and calcite-animate__in-right classes.
• Updates demo page with new classes, and updates demo page "Reset" button functionality.
• Q - I am imagining for now components will set the correct animation where needed based on rtl. Not sure if there's a better way to make these rtl / ltr supportive with the classes themselves.