Modified 3 tests in opennlp-tools to handle any iteration order

Three tests

• `opennlp.tools.dictionary.DictionaryAsSetCaseInsensitiveTest.testEquals`
• `opennlp.tools.dictionary.DictionaryAsSetCaseInsensitiveTest.testEqualsDifferentCase`
• `opennlp.tools.dictionary.DictionaryAsSetCaseInsensitiveTest.testEquals`

The tests fail because in the `equals` method for comparing elements within a Set also handles the ordering of elements as well.

The `entrySet` here is a HashSet which doesn't maintain a constant order as mentioned in the [Java_17_documentation]https://docs.oracle.com/en/java/javase/17/docs/api/java.base/java/util/HashSet.html.

/opennlp-tools/src/main/java/opennlp/tools/dictionary/Dictionary.java:95

Encountered the following error messages:

org.opentest4j.AssertionFailedError: expected: <[1a, 1b]> but was: <[1b, 1a]>
at opennlp.tools.dictionary.DictionaryAsSetCaseInsensitiveTest.testEquals(DictionaryAsSetCaseInsensitiveTest.java:121)

org.opentest4j.AssertionFailedError: expected: <[1a, 1b]> but was: <[1B, 1A]>
at opennlp.tools.dictionary.DictionaryAsSetCaseInsensitiveTest.testEqualsDifferentCase(DictionaryAsSetCaseInsensitiveTest.java:142)

org.opentest4j.AssertionFailedError: expected: <[1a, 1b]> but was: <[1b, 1a]>
at opennlp.tools.dictionary.DictionaryAsSetCaseSensitiveTest.testEquals(DictionaryAsSetCaseInsensitiveTest.java:121)

The solution involves updating the assert statements to validate the presence of all elements regardless of their order.

REPRODUCE:

```

mvn edu.illinois:nondex-maven-plugin:2.1.7-SNAPSHOT:nondex -Dtest=opennlp.tools.dictionary.DictionaryAsSetCaseInsensitiveTest#testEquals

```

 Can I proceed and create PR ?