refactor: Replace Trove PrimeFinder with io.deephaven.hash.PrimeFinder

Swap gnu.trove.impl.PrimeFinder for io.deephaven.hash.PrimeFinder
(from libs.deephaven.hash, already on the compile classpath of both
Base and Util) in the four files that used it:

  Base/cache/KeyedObjectCache.java
  Base/cache/OpenAddressedCanonicalizationCache.java
  Util/datastructures/WeakIdentityHashSet.java
  Util/datastructures/hash/HashMapBase.java

PrimeFinder.nextPrime(int) is the only API used and has identical
semantics in both implementations, so this is a pure import swap.

Existing user io.deephaven.engine.table.impl.by.HashedRunFinder
already pulls from io.deephaven.hash.PrimeFinder; this commit
brings the four remaining call sites into line.

libs.trove is left in place on Base and Util because RetentionCache
(Constants, TObjectIntCustomHashMap, IdentityHashingStrategy) and
HashMapBase (TLongLongMap, TLongCollection, etc.) still reference
other Trove types.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: cpwright

Base/src/main/java/io/deephaven/base/cache/KeyedObjectCache.java

@@ -4,9 +4,9 @@
 package io.deephaven.base.cache;
 
 import io.deephaven.base.MathUtil;
-import io.deephaven.hash.KeyedObjectKey;
 import io.deephaven.base.verify.Require;
-import gnu.trove.impl.PrimeFinder;
+import io.deephaven.hash.KeyedObjectKey;
+import io.deephaven.hash.PrimeFinder;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Random;

Base/src/main/java/io/deephaven/base/cache/OpenAddressedCanonicalizationCache.java

@@ -5,7 +5,7 @@
 
 import io.deephaven.base.verify.Assert;
 import io.deephaven.base.verify.Require;
-import gnu.trove.impl.PrimeFinder;
+import io.deephaven.hash.PrimeFinder;
 import org.jetbrains.annotations.NotNull;
 
 import java.lang.ref.ReferenceQueue;

Util/src/main/java/io/deephaven/util/datastructures/WeakIdentityHashSet.java

@@ -3,7 +3,7 @@
 //
 package io.deephaven.util.datastructures;
 
-import gnu.trove.impl.PrimeFinder;
+import io.deephaven.hash.PrimeFinder;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 

Util/src/main/java/io/deephaven/util/datastructures/hash/HashMapBase.java

@@ -6,8 +6,8 @@
 import io.deephaven.base.verify.Assert;
 import gnu.trove.TLongCollection;
 import gnu.trove.function.TLongFunction;
-import gnu.trove.impl.PrimeFinder;
 import gnu.trove.iterator.TLongLongIterator;
+import io.deephaven.hash.PrimeFinder;
 import gnu.trove.map.TLongLongMap;
 import gnu.trove.procedure.TLongLongProcedure;
 import gnu.trove.procedure.TLongProcedure;