feat:when reload doriccontext,release the js resource

doric-android/doric/src/main/java/pub/doric/DoricContext.java

@@ -199,6 +199,7 @@ public class DoricContext {
     }
 
     public void reload(String script) {
+        getDriver().destroyContext(getContextId());
         for (DoricJavaPlugin javaPlugin : mPluginMap.values()) {
             javaPlugin.onTearDown();
         }

doric-iOS/Pod/Classes/DoricContext.m

@@ -97,6 +97,7 @@ - (void)build:(CGSize)size {
 }
 
 - (void)reload:(NSString *)script {
+    [self.driver destroyContext:self.contextId];
     self.rootNode.viewId = nil;
     self.script = script;
     [self.driver createContext:self.contextId script:script source:self.source];