feat: Implement GET /:tenantId/destinations query params (#92)

* chore: Store destination type in summary

* chore: Rename destination type "webhooks" to "webhook"

* test: Refactor test to better test the API surface behavior

* feat: Destination filter

* chore: Ensure destination filter * case

* feat: Handle type & topics destination filter query params

* test: e2e tests for destination filter

* chore: Remove log

Author: alexluong