feat(rag): add document parsing structures

pom.xml

@@ -29,6 +29,7 @@
     <properties>
         <java.version>21</java.version>
         <mybatis-plus.version>3.5.16</mybatis-plus.version>
+        <tika.version>3.2.3</tika.version>
     </properties>
     <dependencies>
         <dependency>
@@ -64,6 +65,18 @@
             <artifactId>jackson-annotations</artifactId>
         </dependency>
 
+        <dependency>
+            <groupId>org.apache.tika</groupId>
+            <artifactId>tika-core</artifactId>
+            <version>${tika.version}</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.apache.tika</groupId>
+            <artifactId>tika-parsers-standard-package</artifactId>
+            <version>${tika.version}</version>
+        </dependency>
+
         <dependency>
             <groupId>org.springdoc</groupId>
             <artifactId>springdoc-openapi-starter-webmvc-ui</artifactId>