Provide JDBC implementation of OAuth2AuthorizationService

Add new JDBC implementation of the OAuth2AuthorizationService

Closes gh-245

Author: ovidiupopa07

gradle/dependency-management.gradle

@@ -32,5 +32,6 @@ dependencyManagement {
 		dependency "com.squareup.okhttp3:mockwebserver:3.14.9"
 		dependency "com.squareup.okhttp3:okhttp:3.14.9"
 		dependency "com.jayway.jsonpath:json-path:2.4.0"
+		dependency "org.hsqldb:hsqldb:2.5.+"
 	}
 }

oauth2-authorization-server/spring-security-oauth2-authorization-server.gradle

@@ -10,13 +10,17 @@ dependencies {
 	compile 'com.nimbusds:nimbus-jose-jwt'
 	compile 'com.fasterxml.jackson.core:jackson-databind'
 
+	optional 'org.springframework:spring-jdbc'
+
 	testCompile 'org.springframework.security:spring-security-test'
 	testCompile 'org.springframework:spring-webmvc'
 	testCompile 'junit:junit'
 	testCompile 'org.assertj:assertj-core'
 	testCompile 'org.mockito:mockito-core'
 	testCompile 'com.jayway.jsonpath:json-path'
 
+	testRuntime 'org.hsqldb:hsqldb'
+
 	provided 'javax.servlet:javax.servlet-api'
 }