Add auto import of a data.json file similar in function and purpose to Spring Boot's support for data.sql when using a SQL database

[jxblum]

As an Spring application developer, I want to create and declare a data.json file in my application classpath containing JSON objects to preload an Apache Geode Region with data.

Perhaps the filename format could be:

data-<Region-Name>.json

The <Region-Name> would refer to the Geode cache Region in which the data would be loaded.

Alternatively, we could also support XML.