[kotlin-spring] add reactive behavior via Kotlin coroutines (#2934)

* kotlin spring : add reactivity via kotlin's coroutines

* add kotlin spring boot reactive samples

* bug : fix spring version and import for coroutines

* remove exception handler for reactive (webflux doesn't support it)

* add spring milestone repository to maven pom

* add reactive type for list in Api and ApiImpl methodes for mathching body responsive parameter

* fix baseType for ArraySchema

* regenerate samples

* updating documentation

bin/openapi3/kotlin-springboot-petstore-server-reactive.sh

@@ -0,0 +1,35 @@
+#!/bin/sh
+
+SCRIPT="$0"
+echo "# START SCRIPT: $SCRIPT"
+
+while [ -h "$SCRIPT" ] ; do
+  ls=$(ls -ld "$SCRIPT")
+  link=$(expr "$ls" : '.*-> \(.*\)$')
+  if expr "$link" : '/.*' > /dev/null; then
+    SCRIPT="$link"
+  else
+    SCRIPT=$(dirname "$SCRIPT")/"$link"
+  fi
+done
+
+if [ ! -d "${APP_DIR}" ]; then
+  APP_DIR=$(dirname "$SCRIPT")/..
+  APP_DIR=$(cd "${APP_DIR}"; pwd)
+fi
+
+executable="./modules/openapi-generator-cli/target/openapi-generator-cli.jar"
+
+if [ ! -f "$executable" ]
+then
+  mvn clean package
+fi
+
+export JAVA_OPTS="${JAVA_OPTS} -Xmx1024M -DloggerPath=conf/log4j.properties"
+ags="$@ generate -i modules/openapi-generator/src/test/resources/3_0/petstore.yaml -t modules/openapi-generator/src/main/resources/kotlin-spring -g kotlin-spring -o samples/server/openapi3/petstore/kotlin-springboot-reactive --additional-properties=library=spring-boot,beanValidations=true,swaggerAnnotations=true,serviceImplementation=true,reactive=true"
+
+echo "Cleaning previously generated files if any from samples/server/openapi3/petstore/kotlin-springboot-reactive"
+rm -rf samples/server/openapi3/petstore/kotlin-springboot-reactive
+
+echo "Generating Kotling Spring Boot server..."
+java $JAVA_OPTS -jar $executable $ags