Add support for CSS objects to the styled-components CSS prop (#35774)

* Add support for CSS objects to the styled-components CSS prop

This is valid styled-components code, but TypeScript throws an error:

```JS
<div css={{ color: 'blue' }} />
```

* Uncomment test for objects in css prop

types/styled-components/index.d.ts

@@ -510,6 +510,7 @@ export class StyleSheetManager extends React.Component<
 // ONLY string literals and inline invocations of css`` are supported, anything else crashes the plugin
 export type CSSProp<T = AnyIfEmpty<DefaultTheme>> =
     | string
+    | CSSObject
     | FlattenInterpolation<ThemeProps<T>>;
 
 export default styled;

types/styled-components/test/index.tsx

@@ -809,11 +809,7 @@ function cssProp() {
     return (
         <>
             <div css="background: blue;" />
-            {/*
-                For some reason $ExpectError doesn't work on this expression.
-                Only strings work, objects crash the plugin.
-                <div css={{ background: "blue" }} />
-            */}
+            <div css={{ background: "blue" }} />
             <div
                 // would be nice to be able to turn this into an error as it also crashes the plugin,
                 // but this is how optional properties work in TypeScript...