Create common base class for all caching mechanisms

[LocalNewsTV]

Describe the task

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Find commonalities between our Caching classes and create a base class to extend from.

Value Add

• Consistency between caching mechanisms
• Clear purpose for functionality

Acceptance Criteria

• base class created
• Common abstract methods lifted into new base class

Additional Context

• Currently we cache map tiles and UserRecords, but we're extending Cache functionality into data like Wells, and Offline User Records for data integrity. This as a pre-step lets us maintain consistency across past/present/future caching. Making Maintenance and onboarding simpler.