Change page-size behavior for `fga tuple read`

[aaguiarz]

Currently, If you run:

fga tuple read  --max-pages=0

The CLI will get all the tuples in the model, using the default page size which is 50. Given we want to read all tuples, it will be more efficient to use the max page-size which is 100. We could also allow specifying the page-size instead of always using 50.

We should set the max-pages according to this rules:

• When max-pages=0, default page-size should be 100
• When max-pages!=0, default page-size should be 50. It's the current behavior and changing it might be a breaking change.
• If page-size is specified as a parameter, always use whatever is specifiedl