[Feature]: NWBZarrIO should have load_namespaces=True by default

[rly]

What would you like to see added to HDMF-ZARR?

Following this change in PyNWB NeurodataWithoutBorders/pynwb#1748

Is your feature request related to a problem?

No response

What solution would you like?

Consistency between NWBHDF5IO and NWBZarrIO

Do you have any interest in helping implement the feature?

No.

Code of Conduct

• I agree to follow this project's Code of Conduct
• Have you checked the Contributing document?
• Have you ensured this change was not already requested?

[mavaylon1]

I'll take a look next week.

[mavaylon1]

Context: We want to have load_namespaces to be True by default. This reads cached schemas and automatically tries to generate the API for any missing namespaces. The prime example being extensions.

On the pynwb side, I do not see any tests involving a roundtrip for a file with extensions, testing the whole load_namespace finding the cached schemas.