Suggestion: Support "lazy" access to property values

[ehennestad]

Use matnwb's DataStub class to read data "lazily" from files. This lets users index into large datasets without loading/downloading the whole file. This can be particularly useful in combination with reading data directly from remote files, where users can read subsets of datasets from large remote files without downloading the whole file.

[SDV96]

IS THIS ISSUE SOLVED I CAN IMPROVE IT By..... if @ehennestad approves assign within 1 WEEKS {WORKING NOW}