feat(collections): add async and optimistic reactive collection factories

[Monkeylordz]

Adds @solid-primitives/collections with createReactiveMap, createReactiveSet, createReactiveWeakMap, and createReactiveWeakSet. Each collection supports mutable entries and compute functions while preserving lazy, independent subscriptions to individual keys or members.

• Compute functions can mutate an initially empty draft, return replacement contents, await a result, or yield async updates. Collections integrate with Solid loading, refresh, optimistic actions, and SSR/hydration.
• Strong collections preserve insertion order and live iteration. Weak collections use weak key/value storage, with an optional SSR codec exported from @solid-primitives/collections/serialization.
• The existing map/set packages link to the new package for discoverability. Collection-specific tests, benchmarks, scripts, and implementation notes live in the collections package.
• Ten Storybook examples cover basic usage, async computes, async iterables, optimistic acceptance/rollback, and weak variants for both Map and Set. Their source panels display the example implementations. The shared preview prebundles the signals runtime consistently.

These are explicitly NOT in the map/set packages, because they use a shared backend. I considered re-exporting them in those packages but decided against it - this collections would still need to be published to prevent duplicate code, and then we would be exporting the same thing in two different packages.

This is a draft pending the required Solid fixes and a release containing them:

• fix(signals,solid): preserve shallow leaves and sequence hybrid hydration solidjs/solid#3499 — shallow leaf identity and hybrid hydration ordering.
• Derived stores retain obsolete values after latest/isPending readers are disposed solidjs/solid#3503 — obsolete values retained after derived-store reader disposal.

Before marking this ready, update to the appropriate Solid release, confirm the supported peer dependency range, and rerun the full runtime, SSR/hydration, and development/production GC suites.

Validation: collection build, type checks, lint, story formatting, and the full shared Storybook production build pass. Runtime, SSR, and GC checks currently fail against the installed Solid 2.0.0-rc.0, which lacks the required behavior and the newer solid-js/internal export used by server tests. Those regression checks remain enabled; the test runner stops before hydration if SSR fixture generation fails.

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