Add ArrayList Implementation and Comprehensive Unit Tests

[walmir-silva]

• Implemented the ArrayList class in the KaririCode\DataStructure\Collection namespace.
• Added comprehensive unit tests for the ArrayList class in the KaririCode\DataStructure\Tests\Collection namespace.

Class:

• KaririCode\DataStructure\Collection\ArrayList

Tests:

• KaririCode\DataStructure\Tests\Collection\ArrayListTest

Implemented Features and Corresponding Tests:

• Added method: testAddElementAddsElementToList
• Add all elements method: testAddAllElementsAddsAllElementsFromAnotherCollection
• Remove element method: testRemoveElementRemovesElementFromList
• Contains element method: testContainsElementReturnsTrueIfElementExists
• Clear elements method: testClearElementsRemovesAllElementsFromList
• Check if list is empty method: testIsEmptyReturnsTrueIfListIsEmpty
• Get items method: testGetItemsReturnsAllElementsInList
• Count elements method: testCountElementsReturnsNumberOfElementsInList
• Get element by index method: testGetElementByIndexThrowsExceptionForInvalidIndex
• Set element by index method: testSetElementByIndexThrowsExceptionForInvalidIndex
• Iterate over elements method: testIterationOverElementsReturnsAllElements
• Handling different data types: testDifferentDataTypesCanBeAddedToList
• Mass add and remove elements: testMassAddAndRemoveHandlesLargeNumberOfElements
• Index consistency after removal: testIndexConsistencyAfterRemoval
• Out of bounds access method: testOutOfBoundsAccessThrowsException
• Out of bounds set method: testOutOfBoundsSetThrowsException
• Out of bounds remove method: testOutOfBoundsRemoveReturnsFalse
• Handling null values: testHandlingNullValuesCorrectly
• Serialization and deserialization: testSerializationAndDeserialization
• Cloning the list: testCloningCreatesIndependentCopy
• List integrity after mixed operations: testListIntegrityAfterMixedOperations