Add support for keyframes in css calls in ternary operator

[dddlr]

Fix #1682

TODO for next week:

• Add tests
• Add changeset
• Add support for <div css={firstOpen ? fadeInCss : slideInRightCss}>hello world</div> too

[changeset-bot]

⚠️ No Changeset found

Latest commit: 268f522

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[dddlr]

closing this stale PR i'm probably not going to get to, feel free to copy the contents over to a new PR if you want to get it merged in!