Easing Functions (Tweening)

**Is your feature request related to a problem? Please describe.**
Would you consider adding CSS style easing functions to something like `@std/animations`

I would like functions like these: https://easings.net/
to be in std. (optional) so they can be optimized into the rust code directly
**Describe the solution you'd like**

**Describe alternatives you've considered**
There are lots of packages that do this already like `d3-ease`. but there are many duplicate packages with the same functions. id like it to be standard so Deno users don't have to choose which one to use.