add retained page size test

[fauna-chase]

This just adds a test to ensure we maintain the page size across subsequent requests to get more pages

Change types

• • Bug fix (non-breaking change that fixes an issue)
• • New feature (non-breaking change that adds functionality)
• • Breaking change (backwards-incompatible fix or feature)

Checklist:

• • My code follows the code style of this project.
• • My change requires a change to Fauna documentation.
• • My change requires a change to the README, and I have updated it accordingly.

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[erickpintor]

🐑 it.