Add DynamicReactiveView and rename Query API

[ChrisPulman]

Rename QuaternaryList.Query to GetItemsBySecondaryIndex and update usages (tests, benchmarks, README).
Introduce DynamicReactiveView and multiple QuaternaryExtensions to support dynamic/filterable reactive views (including CreateView variants and FilterBySecondaryIndex/FilterDynamic).
Update IQuaternaryList to expose ICollection, INotifyCollectionChanged and IDisposable, and change Edit to accept Action<ICollection>.
Make several internal API/implementation tweaks: QuadList AddRange signature and enumerator type/Dispose adjustments, QuadDictionary.Dispose marked readonly, QuaternaryBase adds event processing / INCC adapter stubs.
Add DynamicSearchTests and update existing tests to use the new API.
Update README to document unsupported index-based operations and new API names, and add demo/test app view files.
These changes clarify index semantics, enable dynamic reactive views, and keep implementations consistent with the new APIs.

Introduce explicit batch actions and secondary-index matching across the quaternary collection stack.

Summary of changes:

• Add CacheAction.BatchAdded and CacheAction.BatchRemoved and update tests to expect 7 enum values.
• ReactiveView and DynamicReactiveView now handle BatchAdded and BatchRemoved notifications (remove/add items from view accordingly).
• QuaternaryList: emit BatchAdded for AddRange and new helpers to emit batch-removed events (EmitBatchRemoved, EmitBatchRemovedFromList). Add ItemMatchesSecondaryIndex for runtime secondary-index key comparisons and use MatchesKey on indices.
• ISecondaryIndex: add MatchesKey(T item, object key) contract; SecondaryIndex<T,TKey> implements MatchesKey using the selector and EqualityComparer.
• QuaternaryExtensions: take array snapshots (ToArray) for thread-safety, change secondary-index view creation to use ItemMatchesSecondaryIndex so filtering is dynamic, simplify and optimize key-based lookups (LINQ usage and HashSet for keys), and adjust observable-based filters to use SelectMany and HashSet.
• Tests: add new QuaternaryExtensionsTests and update QuaternaryListTests (migrate to NET8, switch FluentAssertions to xUnit Assert, adjust expectations for new batch actions and behaviors).
• AddressBookViewModel: use fluent disposables, replace some ToList()/ToArray() usage, use RemoveKeys for bulk dictionary sync, dispose adjustments, and chain ToProperty with DisposeWith.

These changes make batch operations explicit (added vs removed), improve secondary-index filtering correctness and performance, and update tests and sample code to align with the new behaviors.