Create `@layerstack/state` package (migrate `@layerstack/svelte-stores`)

[techniq]

Migrate most/all of the stores currently in @layerstack/svelte-stores

• changeStore
  • see also runed previous
• debounceStore
  • see also runed Debounced
• dirtyStore
• fetchStore
  • see also runed resource
• formStore
• graphStore
• localStore
  • see also runed PersistedState
• mapStore just use SvelteMap from svelte/reactivity
• matchMedia => `MediaQueryPresets
• paginationStore
• promiseStore
  • see also runed resource?
• quaryParamsStore
  • see also sveltekit-search-params
• selectionStore => SelectionState
• tableOrderStore
• themeStore
• timerStore
• uniqueStore => UniqueState