BAEL-2435 Add JPA and H2 dependencies

Add JPA and H2 dependencies to allow event sourcing, as for event
sourcing and EventStore is mandatory, and to make an EventStore a
database needs to be present for Axon's auto-configuration

axon/pom.xml

@@ -44,6 +44,17 @@
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-web</artifactId>
         </dependency>
+
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-data-jpa</artifactId>
+        </dependency>
+
+        <dependency>
+            <groupId>com.h2database</groupId>
+            <artifactId>h2</artifactId>
+            <scope>runtime</scope>
+        </dependency>
     </dependencies>
 
     <properties>