story(rest): implement slice events api

As an end user, I want to retrieve multiple events using a RESTful API, so that I don't need to introduce a new tech (gRPC) to my existing stack.

RESTful route is defined
Should fetch events from eventstore
Same filtering options are supported as the gRPC API
Should return "200 OK" and the events as JSON in the response body
In case of failure, an appropriate code along with an JSON response object should be returned

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