Remove submodule grace-datastore-gorm-rx that no longer exists

Closes gh-7

Author: rainboyan

grace-datastore-gorm-test/build.gradle

@@ -3,7 +3,6 @@ dependencies {
             project(":grace-datastore-core")
 
     implementation "com.github.ben-manes.caffeine:caffeine:$caffeineVersion"
-    testImplementation project(":grace-datastore-gorm-rx")
     testImplementation project(":grace-datastore-gorm-tck")
     testImplementation "org.apache.groovy:groovy-json:$groovyVersion"
     testRuntimeOnly "org.springframework:spring-aop:$springVersion"

settings.gradle

@@ -10,9 +10,5 @@ include ("grace-datastore-core",
         'grace-datastore-gorm-validation',
         'grace-datastore-gorm-support',
         'grace-datastore-gorm-tck',
-        'grace-datastore-gorm-test',
-
-
-        // RX projects
-        'grace-datastore-gorm-rx'
+        'grace-datastore-gorm-test'
 )