[Java] DictionaryProvider leaks memory while adding dictionaries with duplicate encoding

DictionaryProvider leaks memory while adding dictionaries with duplicate encoding. Is this expected? Should the provider release the memory of the existing dictionary vector if it accepts another one with same encoding id ?

Sample code:
```java

"dictionaryProvider" should " not leak memory while adding dictionaries with duplicate encoding" in {

val allocator: RootAllocator = new RootAllocator()

val vector: ListVector = ListVector.empty("vector", allocator)
val dictionaryVector1: ListVector = ListVector.empty("dict1", allocator)
val dictionaryVector2: ListVector = ListVector.empty("dict2", allocator)

val writer1: UnionListWriter = vector.getWriter
writer1.allocate
writer1.setValueCount(1)

val dictWriter1: UnionListWriter = dictionaryVector1.getWriter
dictWriter1.allocate
dictWriter1.setValueCount(1)

val dictWriter2: UnionListWriter = dictionaryVector2.getWriter
dictWriter2.allocate
dictWriter2.setValueCount(1)

val dictionary1: Dictionary = new Dictionary(dictionaryVector1, new DictionaryEncoding(1L, false, None.orNull))
val dictionary2: Dictionary = new Dictionary(dictionaryVector2, new DictionaryEncoding(1L, false, None.orNull))

val provider = new DictionaryProvider.MapDictionaryProvider
provider.put(dictionary1)
provider.put(dictionary2)

vector.clear()
provider.getDictionaryIds.asScala.map(id => provider.lookup(id).getVector.clear())

allocator.getAllocatedMemory shouldBe 0
}
```

**Reporter**: [Vimal Varghese](https://issues.apache.org/jira/browse/ARROW-16920)

_{**Note**: *This issue was originally created as [ARROW-16920](https://issues.apache.org/jira/browse/ARROW-16920). Please see the [migration documentation](https://github.com/apache/arrow/issues/14542) for further details.*}

从 DictionaryProvider.MapDictionaryProvider 开始，运行提供的复现步骤：添加两个 encoding ID 为 1 的字典，清空 vector，并检查 allocator 内存。跟踪插入第二个字典时第一个字典发生了什么；完成标准是重复 encoding 的情况释放所有已分配的内存，并且最终的分配检查达到零。

由索引模型根据 Issue 内容生成。