[Feature]: Create convenience function / iterator to rechunk and export an existing dataset

[rly]

What would you like to see added to HDMF?

The data will need to be loaded into memory iteratively and rewritten. HDF5 repack appears to load the dataset into memory and stall when it is too big.

What solution would you like?

A convenience function to iterate through existing chunks and write new chunks with a different shape.

Do you have any interest in helping implement the feature?

Yes.