Introduce InterestBuilder class to appropriately and flexibly express interests in keys/values between client/server when using JavaConfig.

This JIRA will add an InterestsBuilder class in SDG for building a Region Interests registration in GemFire or Geode.

The Builder will intelligently determine whether the Interests registration needs to be based on a regular expression, or is a regular Interests registration based on the key expression.

Additionally, the existing SDG Interests class hierarchy (with RegexInterest) will be re-evaluated and possible refactored into a single Interest class type with an accompanying Enum.