[app-wiring-refactor]: Apply review comments:

- Add reference to original library in `FluentBuilder`.
- Change `I<Name>` notation to `<Name>Impl` notation.
- Move error config to test resources
- Add comment with config instruction
- Add config to the documentation

Mage.Common/src/main/java/mage/utils/FluentBuilder.java

@@ -4,6 +4,11 @@ import java.util.ArrayList;
 import java.util.function.Consumer;
 import java.util.function.Supplier;
 
+/**
+ * A base class for fluent, immutable, composable builders.
+ *
+ * @see <a href="https://github.com/fburato/functionalutils/blob/master/utils/src/main/java/com/github/fburato/functionalutils/utils/Builder.java">Builder</a>
+ */
 public abstract class FluentBuilder<ToBuild, RealBuilder extends FluentBuilder<ToBuild, RealBuilder>> {
 
     final ArrayList<Consumer<RealBuilder>> buildSequence;