[Docs] Improve Animation Documentation and Class Availability

[macandcheese]

Description

We can do a better job of documenting the animation classes, and add the "missing" versions (currently, we have in, down, up, scale, but not defined directions like "from-start", or "from-end".

Which Component

All components: https://github.com/Esri/calcite-design-system/blob/main/packages/calcite-components/src/assets/styles/_animation.scss

Resources

This came up as feedback from a user during Developer Summit.

[geospatialem]

Will add some content as part of the design token effort later this year, targeted for late summer.

Update: Target is now scheduled for January.