Dialogs and theme switching

[snowystinger]

Add tests so that we don't break this in the future
Fixed logic in determining which theme to use // importance parent > OS > default > omitted
added a mocking library so that we can change match media during tests easily

Closes https://jira.corp.adobe.com/browse/RSP-1527

✅ Pull Request Checklist:

• Included link to corresponding Issue.
• Added/updated unit tests and storybook for this change (for new code or code which already has tests).
• Filled out test instructions.
• Updated documentation (if it already exists for this component).
• Looked at the Accessibility Practices for this feature - Aria Practices

📝 Test Instructions:

🧢 Your Team:

[LFDanLu]

LGTM, just need to fix the lint issues

[adobe-bot]

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[adobe-bot]

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[adobe-bot]

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[adobe-bot]

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[adobe-bot]

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[adobe-bot]

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[adobe-bot]

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[adobe-bot]

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[codecov]

Codecov Report

Merging #226 into master will increase coverage by 1.13%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #226      +/-   ##
==========================================
+ Coverage   69.44%   70.57%   +1.13%     
==========================================
  Files         206      206              
  Lines        3973     3973              
  Branches      847      847              
==========================================
+ Hits         2759     2804      +45     
+ Misses        625      588      -37     
+ Partials      589      581       -8

Impacted Files	Coverage Δ
...ges/@react-spectrum/tooltip/src/TooltipTrigger.tsx	92.85% <0%> (+7.14%)	⬆️
...kages/@react-aria/tooltip/src/useTooltipTrigger.ts	88.46% <0%> (+11.53%)	⬆️
packages/@react-aria/tooltip/src/useTooltip.ts	75% <0%> (+25%)	⬆️
...es/@react-aria/interactions/src/DOMPropsContext.ts	83.33% <0%> (+33.33%)	⬆️
packages/@react-aria/interactions/src/useHover.ts	73.52% <0%> (+44.11%)	⬆️
...kages/@react-stately/tooltip/src/TooltipManager.ts	69.23% <0%> (+50%)	⬆️
...@react-aria/interactions/src/DOMPropsResponder.tsx	87.5% <0%> (+75%)	⬆️

[adobe-bot]

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[LFDanLu]

LGTM