Implement BatchingSpliterator#trySplit

[pivovarit]

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src/main/java/com/pivovarit/collectors/BatchingSpliterator.java:85

• [nitpick] The variable name 'first' is ambiguous. It should be renamed to 'firstHalf' for better clarity.

var first = source.subList(0, source.size() / 2);

src/main/java/com/pivovarit/collectors/BatchingSpliterator.java:86

• [nitpick] The variable name 'second' is ambiguous. It should be renamed to 'secondHalf' for better clarity.

var second = source.subList(source.size() / 2, source.size());

src/main/java/com/pivovarit/collectors/BatchingSpliterator.java:108

• [nitpick] The parameter name 'numberOfBatches' is too long. It should be renamed to 'numBatches' for consistency and clarity.

private static <T> int actualBatchCount(List<T> list, int numberOfBatches) {