feat: Add display names to public React contexts

[eps1lon]

What:

Give public contexts a distinct name in React DevTools:

Before:

After:

Why:

Easier debugging when inspecting the cache of e.g. <CacheProvider value={cache}>.

How:

Add a displayName property in development to the context.

Checklist:

• [ ] Documentation N/A
• Tests (manually verified in DevTools)
• Code complete
• Changeset

[changeset-bot]

🦋 Changeset detected

Latest commit: 948fcae

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

This PR includes changesets to release 1 package

Name	Type
@emotion/react	Patch

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[codecov]

Codecov Report

Merging #2428 (fe100ae) into main (dcc72d0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head fe100ae differs from pull request most recent head 948fcae. Consider uploading reports for the commit 948fcae to get more accurate results
| Impacted Files | Coverage Δ | |
|---|---|---|
| packages/react/src/context.js | 100.00% <100.00%> (ø) | |
| packages/react/src/theming.js | 100.00% <100.00%> (ø) | |

[Andarist]

You have opened this as a draft - do you want to still add something to this PR?

[eps1lon]

You have opened this as a draft - do you want to still add something to this PR?

Just a habit until CI is either green or waiting for "ready for review". Has some benefits on GitHub since e.g. automatic review requests aren't dispatched until the PR is ready for review.