feat: Add support for disclosure animation

[devongovett]

Closes #7528

Adds --disclosure-panel-width and --disclosure-panel-height CSS variables, which are set to the scrollWidth and scrollHeight of the panel when expanding and collapsing. If any animations are triggered, then we wait to set the hidden attribute until they complete.

In the future this may be possible in native CSS with the interpolate-size: allow-keywords property (currently only in Chrome) along with transition-behavior: allow-discrete, which allows using height: auto and display: none directly. In the meantime, this is a pretty simple polyfill that must be done within the hooks to ensure correct timing.

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## API Changes

@react-aria/disclosure

/@react-aria/disclosure:useDisclosure

 useDisclosure {
   props: AriaDisclosureProps
   state: DisclosureState
-  ref: RefObject<Element | null>
+  ref: RefObject<HTMLElement | null>
   returnVal: undefined
 }

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