feat: add MyBatis CRUD and database integration

pom.xml

@@ -27,12 +27,13 @@
       <artifactId>spring-boot-starter-validation</artifactId>
     </dependency>
     <dependency>
-      <groupId>org.springframework.boot</groupId>
-      <artifactId>spring-boot-starter-data-jpa</artifactId>
+      <groupId>org.mybatis.spring.boot</groupId>
+      <artifactId>mybatis-spring-boot-starter</artifactId>
+      <version>2.3.2</version>
     </dependency>
     <dependency>
-      <groupId>com.h2database</groupId>
-      <artifactId>h2</artifactId>
+      <groupId>com.mysql</groupId>
+      <artifactId>mysql-connector-j</artifactId>
       <scope>runtime</scope>
     </dependency>
     <dependency>