Feat: Introduce API for Searching (nested) Service Binding Properties

[Johannes-Schneider]

Context

The current API (ServiceBinding and TypedMapView) allows only for getting direct (i.e. non-nested) properties.
To get a nested property, currently something like the following is needed:

final ServiceBinding serviceBinding;
final TypedMapView mapView = TypedMapView.of(serviceBinding);

final String
    propertyValue =
    mapView.getMapView("key1").getMapView("key2").getListView("key3").getMapView(2).getString("key4");

This style of accessing nested properties imposes following problems:

• The exact structure of the Service Binding must be know
• The access is very verbose and not very well readable

Request

Consider introducing a new API that allows searching for specific properties.

Suggestions

An API for the TypedMapView could look like this:

public <T> Collection<T> find(@Nonnull final Class<? extends T> entryType, @Nonnull final String entryKeyPattern );
public <T> Optional<T> findFirst( @Nonnull final Class<? extends T> entryType, @Nonnull final String entryKeyPattern );

One could also consider adding extra API for primitive return types:

public int findInteger( @Nonnull final String entryKeyPattern ) throws KeyNotFoundException;

Questions

• Where should we introduce such a new API (ServiceBinding vs. TypedMapView)
• Do we want to support some sort path matching?