Add the ProviderType annotation to public API so that semantic version recommendations on additions to ServiceBuilder services are treated as MINOR changes rather than MAJOR

• Type: Story
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 6.2.0 CE GA1
• Fix Version/s: 6.2.0 CE GA1
• Component/s: Core Infrastructure > Service Builder
• Labels: None
• Environment: any service builder
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/15040

This is a Class level annotation (no runtime dependency) which allows semantic versioning tool to distinguish a Provider API from Consumer APIs (non annotation are assumed Consumer).

Additions to Provider APIs are not considered MAJOR changes since only a few providers implement the API while the vast majority only use the API.

See http://www.osgi.org/wiki/uploads/Links/SemanticVersioning.pdf for more details.