Improve mixing useSignals called in hooks and components together

[andrewiggins]

This PR adds tests and supported for nested useSignals calls when combined in components & hooks. We generally have two different mechanisms to call useSignals: 1) using react-transform & 2) calling useSignals() directly in a component or hook.

To support mixing and matching these scenarios, I've added parameter to useSignals() that specifies how this invocation is being used. It primarily exists for the transform to tell useSignals it is gonna be manually closed by the code the transform emits.

Using this parameter, when I new store starts, it can examine the previous store and properly handle closing it out or "capture and restoring it" once the current store finishes. See the comment in runtime/src/index.ts:_start() for a detailed description of the exact behavior here.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: cb7c2a3271bd05b70c7652781371f91cddb3dfef

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-transform | Minor |

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Size Change: -42 B (0%)

Total Size: 84.1 kB

Filename	Size	Change
docs/dist/assets/client.********.js	46.8 kB	+27 B (0%)
docs/dist/react-********.js	238 B	-2 B (-1%)
packages/react-transform/dist/signals-*********.js	4.75 kB	-85 B (-2%)
packages/react-transform/dist/signals-transform.mjs	4 kB	-85 B (-2%)
packages/react-transform/dist/signals-transform.umd.js	4.87 kB	-82 B (-2%)
packages/react/dist/signals.js	1.52 kB	+91 B (+6%)	🔍
packages/react/dist/signals.mjs	1.49 kB	+94 B (+7%)	🔍

ℹ️ View Unchanged

| Filename | Size | | :--- | :---: | | `docs/dist/assets/index.********.js` | 1.07 kB | | `docs/dist/assets/jsxRuntime.module.********.js` | 281 B | | `docs/dist/assets/preact.module.********.js` | 4.02 kB | | `docs/dist/assets/signals-core.module.********.js` | 1.46 kB | | `docs/dist/assets/signals.module.********.js` | 2.02 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` | 3.41 kB | | `docs/dist/nesting-********.js` | 1.13 kB | | `packages/core/dist/signals-core.js` | 1.54 kB | | `packages/core/dist/signals-core.mjs` | 1.56 kB | | `packages/preact/dist/signals.js` | 1.27 kB | | `packages/preact/dist/signals.mjs` | 1.22 kB |

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