Function split_buffer_v2

pub fn split_buffer_v2(
    buffer: &[u8],
    rep_level_buffer_length: usize,
    def_level_buffer_length: usize,
) -> ParquetResult<EncodedSplitBuffer<'_>>

Splits the page buffer into 3 slices corresponding to (encoded rep levels, encoded def levels, encoded values) for v2 pages.