minifying keyframes

[kishlayraj-9]

What: Keyframes are now minified in production build, which were not earlier.

Why: Production build should always contain minified code so that resultant bundle size is minimum.

How: -> Changes in the minify function of minify-utils.js file of babel-plugin-emotion.
-> Addition of one new file i.e. macro.js file in @emotion/core.

Note - Now, users need to import keyframe from @emotion/core/macro by using the following import,
   "import  {keyframes} from '@emotion/core/macro' ".

Checklist:

• Documentation
• Tests
• Code complete
• Changeset

[changeset-bot]

🦋 Changeset detected

Latest commit: 4d28109

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 13 packages

Name	Type
@emotion/core	Major
babel-plugin-emotion	Major
emotion-theming	Major
@emotion/primitives-core	Major
@emotion/styled-base	Major
@emotion/styled	Major
@emotion/native	Major
@emotion/primitives	Major
@emotion/babel-preset-css-prop	Major
@emotion/css	Major
emotion-server	Major
emotion	Major
benchmarks	Patch

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