https://linear.app/unleash/issue/2-2439/create-new-integration-events-endpointhttps://linear.app/unleash/issue/2-2436/create-new-integration-event-openapi-schemas
This adds a new `/events` endpoint to the Addons API, allowing us to
fetch integration events for a specific integration configuration id.
Also includes:
- `IntegrationEventsSchema`: New schema to represent the response object
of the list of integration events;
- `yarn schema:update`: New `package.json` script to update the OpenAPI
spec file;
- `BasePaginationParameters`: This is copied from Enterprise. After
merging this we should be able to refactor Enterprise to use this one
instead of the one it has, so we don't repeat ourselves;
We're also now correctly representing the BIGSERIAL as BigInt (string +
pattern) in our OpenAPI schema. Otherwise our validation would complain,
since we're saying it's a number in the schema but in fact returning a
string.
