[PR] ddata: Add wildcard prefix subscriptions to Replicator [pekko]

["pjfanning (via GitHub)" <gi...@apache.org>]

pjfanning opened a new pull request, #2735:
URL: https://github.com/apache/pekko/pull/2735

   Port of akka/akka-core#31731. Adds support for subscribing to all keys matching a given prefix by using `*` at the end of the key id. New and existing matching keys both trigger notifications.
   
   part of #2730 
   
   ### `Key`
   - Added `UnspecificKey` — a generic `Key[ReplicatedData]` used to represent matched wildcard keys in notifications
   - Added `withId(newId)` to `Key` abstract class, used internally to construct a concrete key instance for each matched wildcard key
   
   ### `Replicator`
   - Added `wildcardSubscribers` MultiMap (keyed by prefix, i.e. id with `*` stripped)
   - Added private `isWildcard` / `dropWildcard` helpers; applied these consistently to existing `durable`/`durableWildcards` logic too
   - `receiveFlushChanges`: wildcard subscribers are notified for changed keys; new wildcard subscriptions receive current values for all existing matching keys
   - `receiveUnsubscribe` / `receiveTerminated`: clean up `wildcardSubscribers` correctly
   - `hasSubscriber(keyId)` / `getSubscribersIterator(keyId)`: new private methods combining direct and wildcard subscriber lookup
   
   ### Usage
   
   ```scala
   // Subscribe to all keys with the "counter-" prefix
   replicator ! Subscribe(GCounterKey("counter-*"), self)
   
   // Changed(key) notifications arrive for "counter-a", "counter-b", etc.
   // key.id will reflect the actual matched key id
   ```
   


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