Support `keyframes` and `createGlobalStyle` in "@linaria/react"

## Describe the feature

These two functions come from Styled Components.

`keyframes` function will create a CSS keyframes with a unique name, to make sure that there are no naming conflicts.

You can even inline the declaration without having to think of a keyframes name:
```css
div {
animation: ${keyframes`
from {
opacity: 0;
}
`} ease-out 1s;
}
```

`createGlobalStyle` will create a global style for every components to use, without to write it in a single CSS file.

## Motivation

This will make it easier to switch Styled Components to Linaria.