feat: add dryRun flag and emergencyCase sub-provider

Extends Emergency with:
- dryRun(): boolean flag distinguishing training alerts from real
  emergencies (per @L-Evg's suggestion in #1794)
- emergencyCase(): bundles nature, location, instruction, and dryRun
  into an EmergencyCase record for a single-call full emergency

Also fixes the @SInCE tag from 2.7.0 to 2.6.0 (per @kingthorin's review).

Author: mvanhorn

src/main/java/net/datafaker/providers/base/Emergency.java

@@ -2,10 +2,11 @@
 
 /**
  * Generates emergency-related fake data: the nature of an emergency
- * (fire, flood, tornado, ...), a plausible emergency location, and an
- * instruction someone might be asked to follow in response.
+ * (fire, flood, tornado, ...), a plausible emergency location, an
+ * instruction someone might be asked to follow in response, and a
+ * dry-run flag distinguishing training alerts from real emergencies.
  *
- * @since 2.7.0
+ * @since 2.6.0
  */
 public class Emergency extends AbstractProvider<BaseProviders> {
 
@@ -35,4 +36,22 @@ public String location() {
     public String instruction() {
         return resolve("emergency.instruction");
     }
+
+    /**
+     * @return {@code true} for a dry-run (training) alert, {@code false}
+     * for a real emergency.
+     */
+    public boolean dryRun() {
+        return faker.random().nextBoolean();
+    }
+
+    /**
+     * @return a complete emergency case bundling {@link #nature()},
+     * {@link #location()}, {@link #instruction()}, and {@link #dryRun()}.
+     */
+    public EmergencyCase emergencyCase() {
+        return new EmergencyCase(nature(), location(), instruction(), dryRun());
+    }
+
+    public record EmergencyCase(String nature, String location, String instruction, boolean dryRun) { }
 }

src/test/java/net/datafaker/providers/base/EmergencyTest.java

@@ -3,6 +3,10 @@
 import java.util.Collection;
 import java.util.List;
 
+import org.junit.jupiter.api.Test;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
 final class EmergencyTest extends BaseFakerTest {
 
     @Override
@@ -13,4 +17,18 @@ protected Collection<TestSpec> providerListTest() {
             TestSpec.of(emergency::location, "emergency.location"),
             TestSpec.of(emergency::instruction, "emergency.instruction"));
     }
+
+    @Test
+    void shouldReturnDryRunFlag() {
+        assertThat(faker.emergency().dryRun()).isIn(false, true);
+    }
+
+    @Test
+    void shouldReturnEmergencyCase() {
+        Emergency.EmergencyCase emergencyCase = faker.emergency().emergencyCase();
+        assertThat(emergencyCase.nature()).isNotEmpty();
+        assertThat(emergencyCase.location()).isNotEmpty();
+        assertThat(emergencyCase.instruction()).isNotEmpty();
+        assertThat(emergencyCase.dryRun()).isIn(false, true);
+    }
 }