[FLINK-13293] [state-processor-api] [build] Add state processor api to opt/ directory in flink-dist

This closes #9133.

flink-dist/pom.xml

@@ -306,6 +306,13 @@ under the License.
 			<scope>provided</scope>
 		</dependency>
 
+		<dependency>
+			<groupId>org.apache.flink</groupId>
+			<artifactId>flink-state-processor-api_${scala.binary.version}</artifactId>
+			<version>${project.version}</version>
+			<scope>provided</scope>
+		</dependency>
+
 		<dependency>
 			<groupId>org.apache.flink</groupId>
 			<artifactId>flink-azure-fs-hadoop</artifactId>

flink-dist/src/main/assemblies/opt.xml

@@ -75,6 +75,14 @@
 			<fileMode>0644</fileMode>
 		</file>
 
+		<!-- State Processor API -->
+		<file>
+			<source>../flink-libraries/flink-state-processing-api/target/flink-state-processor-api_${scala.binary.version}-${project.version}.jar</source>
+			<outputDirectory>opt/</outputDirectory>
+			<destName>flink-state-processor-api_${scala.binary.version}-${project.version}.jar</destName>
+			<fileMode>0644</fileMode>
+		</file>
+
 		<!-- Metrics -->
 		<file>
 			<source>../flink-metrics/flink-metrics-graphite/target/flink-metrics-graphite-${project.version}.jar</source>