Add enableExposureLogging flag in ConsumableTestDefinition

[bayareabear]

Add lastRevisionDate in TestDefinition so that we can log the test according to their update activity time

[zacharygoodwin]

Need to add field to the ConsumableTestDefinition.

May only need to update the ConsumableTestDefinition and can leave the test definition class alone since the field will be populated by proctor builder rather than stored in the test definition entry in the DB. When the builder runs it calls: https://github.com/indeedeng/proctor/blob/master/proctor-common/src/main/java/com/indeed/proctor/common/ProctorUtils.java#L158 which calls the fromTestDefintion to convert to the object proctor consumers use.

[bayareabear]

This is no longer needed for now