[sensors-5] Redefine sensors in terms of SensorTickData / SensorRunParams
Alternative API for sensors, where a single sensor evaluation can launch multiple runs, each with unique run config and tags
Expose a namedtuple class SensorTickData, that contains a list of SensorRunParams. SensorRunParams contain tags and run_config, which could then be reused for partition set definitions, schedules, etc.
Test Plan: bk
Reviewers: dgibson, schrockn, sandyryza
Reviewed By: dgibson
Differential Revision: https://dagster.phacility.com/D5026