Include Pagination for KeyValue

[nathannaveen]

Description of the PR

Included pagination for queries in KeyValue, and fixed the tests.

Part of issue https://github.com/guacsec/guac/issues/1525

Same as https://github.com/guacsec/guac/pull/1901

PR Checklist

• [ ] All commits have a Developer Certificate of Origin (DCO) -- they are generated using -s flag to git commit.
• [ ] All new changes are covered by tests
• [ ] If GraphQL schema is changed, make generate has been run
• [ ] If OpenAPI spec is changed, make generate has been run
• [ ] If collectsub protobuf has been changed, make proto has been run
• [ ] All CI checks are passing (tests and formatting)
• [ ] All dependent PRs have already been merged