test: add keeper test suite

[jaybxyz]

Description

This PR simply adds KeeperTestSuite boilerplate for testing

Tasks

• [ ]

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• Appropriate labels applied
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• Linked to Github issue with discussion and accepted design OR link to spec that describes this work.
• Code follows the module structure standards.
• Wrote unit and integration
• Updated relevant documentation (docs/) or specification (x/<module>/spec/)
• Added relevant godoc comments.
• Re-reviewed Files changed in the Github PR explorer
• Review Codecov Report in the comment section below once CI passes

[jaybxyz]

I'll close this since this will overlap with #41