Add optimization for sequential access of stored fields

If we are reading the stored-fields of document ids (25, 27, 28, 26, 99), and doc-25 triggers the stored-fields reader to decompress a block containing document ids [10-50], then we can tell the reader to read not only 25, but 26, 27, and 28 to avoid decompressing that block multiple times.

This issue proposes adding a new optimized instance of stored-fields reader that allows users to select the preferred fetching range.