Reorganize signals-react package

[andrewiggins]

Reorganize the signals-react package in preparation for some future explorations to improve the integration with React.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 862235acf458a7d2f40b25c45073b1c280723aac

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

This PR includes changesets to release 1 package

| Name | Type | | --------------------- | ----- | | @preact/signals-react | Patch |

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[github-actions[bot]]

Size Change: +145 B (0%)

Total Size: 69.1 kB

Filename	Size	Change
docs/dist/assets/client.********.js	46.6 kB	+42 B (0%)
docs/dist/nesting-********.js	1.13 kB	+2 B (0%)
docs/dist/react-********.js	239 B	+2 B (+1%)
packages/react/dist/signals.js	1.25 kB	+39 B (+3%)
packages/react/dist/signals.mjs	1.21 kB	+60 B (+5%)	🔍

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `docs/dist/assets/index.********.js` | 835 B | | `docs/dist/assets/jsxRuntime.module.********.js` | 282 B | | `docs/dist/assets/preact.module.********.js` | 4 kB | | `docs/dist/assets/signals-core.module.********.js` | 1.42 kB | | `docs/dist/assets/signals.module.********.js` | 1.97 kB | | `docs/dist/assets/style.********.js` | 21 B | | `docs/dist/assets/style.********.css` | 1.21 kB | | `docs/dist/basic-********.js` | 244 B | | `docs/dist/demos-********.js` | 3.35 kB | | `packages/core/dist/signals-core.js` | 1.48 kB | | `packages/core/dist/signals-core.mjs` | 1.5 kB | | `packages/preact/dist/signals.js` | 1.2 kB | | `packages/preact/dist/signals.mjs` | 1.15 kB |

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