[Feature]: Expandable datasets (HDF5)

[mavaylon1]

What would you like to see added to HDMF?

We previously implemented VectorData expanable by default, but had to pull it from production. https://github.com/hdmf-dev/hdmf/pull/1093/files#diff-508770382f78baf6681e42837b28809b522de14e7fa401c32daffa28538396c4

We are doing round 2:

1. Implement the same setup as the ticket above; however, pull shape information from the schema. There are examples where you have multiple shape options in the schema; we need to ensure that the shape option used matches the shape of the data. If there is no shape, determine via dim of the data.
2. We want to support dataset of references also being expandable. Look to append ticket: https://github.com/hdmf-dev/hdmf/pull/1135/files#diff-2f0fd76dfef06a7d2164a052a72a224ea80cafbfde6dd753aca67d2b1eb02145

What solution would you like?

above

Do you have any interest in helping implement the feature?

Yes.

[mavaylon1]

Related #1064

[mavaylon1]

We need to add a field within the builders called "permissible_shape" to pass the spec shape info into the builder