DBZ-5154 Support scripting in Debezium Server

Add Debezium scripting and it's optional JSR 223 dependencies into
server distribution in `lib_opt` directory.

Add these jars into classpath when `ENABLE_DEBEZIUM_SCRIPTING` env.
variable is set to `true`. Otherwise scripting jars are not loaded.

debezium-server/debezium-server-dist/pom.xml

@@ -64,6 +64,16 @@
                     <groupId>io.debezium</groupId>
                     <artifactId>debezium-connector-sqlserver</artifactId>
                 </dependency>
+		<dependency>
+                    <groupId>io.debezium</groupId>
+                    <artifactId>debezium-scripting</artifactId>
+                </dependency>
+		<dependency>
+                    <groupId>io.debezium</groupId>
+                    <artifactId>debezium-scripting-languages</artifactId>
+		    <type>pom</type>
+		    <scope>import</scope>
+                </dependency>
                 <dependency>
                     <groupId>io.debezium</groupId>
                     <artifactId>debezium-server-core</artifactId>

debezium-server/debezium-server-dist/src/main/resources/assemblies/server-distribution.xml

@@ -24,8 +24,21 @@
             <exclude>org.apache.maven:*:*</exclude>
             <exclude>log4j:log4j:*</exclude>
             <exclude>ch.qos.reload4j:reload4j</exclude>
+	    <exclude>io.debezium:debezium-scripting:*</exclude>
+	    <exclude>io.debezium:debezium-scripting-opt-depts:*</exclude>
           </excludes>
       </dependencySet>
+      <dependencySet>
+          <outputDirectory>${project.parent.artifactId}/lib_opt</outputDirectory>
+          <unpack>false</unpack>
+          <scope>runtime</scope>
+          <useProjectArtifact>false</useProjectArtifact>
+          <useTransitiveFiltering>true</useTransitiveFiltering>
+	  <includes>
+	    <include>io.debezium:debezium-scripting:*</include>
+	    <include>io.debezium:debezium-scripting-languages:*</include>
+	  </includes>
+      </dependencySet>
   </dependencySets>
   <fileSets>
     <fileSet>

debezium-server/debezium-server-dist/src/main/resources/distro/run.bat

@@ -4,4 +4,6 @@ SET JAVA_BINARY=%JAVA_HOME%\bin\java
 
 for %%i in (debezium-server-*runner.jar) do set RUNNER=%%~i
 echo %RUNNER%
-call "%JAVA_BINARY%" %DEBEZIUM_OPTS% %JAVA_OPTS% -cp %RUNNER%%PATH_SEP%conf%PATH_SEP%lib\* io.debezium.server.Main
+SET LIB_PATH=lib\*
+IF %ENABLE_DEBEZIUM_SCRIPTING%=="true" LIB_PATH=%LIB_PATH%%PATH_SEP%lib_opt\*
+call "%JAVA_BINARY%" %DEBEZIUM_OPTS% %JAVA_OPTS% -cp %RUNNER%%PATH_SEP%conf%PATH_SEP%%LIB_PATH% io.debezium.server.Main

debezium-server/debezium-server-dist/src/main/resources/distro/run.sh

@@ -19,4 +19,10 @@ fi
 
 RUNNER=$(ls debezium-server-*runner.jar)
 
-exec "$JAVA_BINARY" $DEBEZIUM_OPTS $JAVA_OPTS -cp "$RUNNER"$PATH_SEP"conf"$PATH_SEP"lib/*" io.debezium.server.Main
+ENABLE_DEBEZIUM_SCRIPTING=${ENABLE_DEBEZIUM_SCRIPTING:-false}
+LIB_PATH="lib/*"
+if [[ "${ENABLE_DEBEZIUM_SCRIPTING}" == "true" ]]; then
+    LIB_PATH=$LIB_PATH$PATH_SEP"lib_opt/*"
+fi
+
+exec "$JAVA_BINARY" $DEBEZIUM_OPTS $JAVA_OPTS -cp "$RUNNER"$PATH_SEP"conf"$PATH_SEP$LIB_PATH io.debezium.server.Main