source-airtable: discover generates incomplete schema

[alafanechere]

Environment

• Source-connector: source-airtable:0.1.2

Current Behavior

The generated catalog misses some fields on Airtable stream if these fields are null in the first row of a table.
It breaks downstream normization

Expected Behavior

The discovered catalog is complete

[bazarnov]

@alafanechere here is the explanation of what is happening during the discovery stage with this connector:
#11757 (comment)

This problem could be resolved only by accessing Metadata API, otherwise, we will have an incomplete or broken schema.

[alafanechere]

@bazarnov I opened a PR to suggest a small improvement that could mitigate the problem a bit: #18491

[bazarnov]

I think this one could be closed for now, until we decide to use Metadata API

[YowanR]

Hey all, FYI that there's some update on the Metadata part . It's in Beta but might be sufficient to unblock.
cc @lazebnyi can we just see if the changes from Airtable are enough to unblock? Probably work for Q1 2023 :)