Provide an endpoint to return a single ProfileProviderService

[pjmonks]

Description

There are two additions to mdm-plugin-profile that I think would be beneficial. This will help with metadata search.

Get single Profile Provider Service

There is currently only an endpoint to return a list of ProfileProviderService objects:

GET /profiles/providers

However, there is no endpoint to get a single ProfileProviderService. This should be added:

GET /profiles/providers/{profileNamespace}/{profileName}/{profileVersion?}

Where:

1. profileNamespace and profileName are mandatory, profileVersion is optional
2. Should return a single instance of the requested ProfileProviderService

This would then align with other REST endpoints by providing both an index and show controller action for providers.

List profile provider services by latest version

The GET /profiles/providers endpoint will always return every ProfileProviderService, including multiple version, since latestVersionByMetadataNamespace is hardcoded to be false. latestVersionByMetadataNamespace should be provided as an optional query parameter to allow the caller to decide this.