Jss: keyframes animations doesn't work

[AleshaOleg]

__Expected behavior:__
Animation with keyframes doesn't work.

__Describe the bug:__
Seems for some reason JSS@10 doesn't understand keyframes syntax and don't animate necessary things. For JSS@9 everything works as expected.

__Codesandbox link:__
https://codesandbox.io/s/core-jss-playground-rp536

__Versions (please complete the following information):__

• jss: 10.0.0-alpha.17
• Browser [e.g. chrome, safari]: Chrome
• OS [e.g. Windows, macOS]: macOS
  Feel free to add any additional versions which you may think are relevant to the bug.

[kof]

JSS 10 scopes keyframe names by default, animation: "$backgroundAfter 1s infinite"

For global identifiers, a keyframe needs to be inside of @global rule

[kof]

see https://github.com/cssinjs/jss/blob/master/changelog.md#breaking-changes-2

[kof]

Documentation seems ok to me, if you think we need to improve in communication or documentation please reopen.