Refactor/invoke module api

[andycall]

Resigin Webf Module API

Break Changes

webf.methodChanne's API had been changed.

Before

type MethodHandler = (method: string, args: any[]) => void;
interface MethodChannel {
    addMethodCallHandler(handler: MethodHandler): void;
    removeMethodCallHandler(handler: MethodHandler): void;
    invokeMethod(method: string, ...args: any[]): Promise<string>
}

After

type MethodCallHandler = (args: any[]) => any;
interface MethodChannel {
    addMethodCallHandler(method: string, handler: MethodCallHandler): void;
    removeMethodCallHandler(method: string): void;
    clearMethodCallHandler(): void;
    invokeMethod(method: string, ...args: any[]): Promise<any>
}

1. Now you can return any JavaScript type of values to dart in the MethodCallHandler handler.
2. Now webf.methodChannel.invokeMethod can return any types of JavaScript values.
3. Only one method with the same names could be exist. Multiple handlers support are removed.
4. Add webf.methodChannel.clearMethodCallHandler() API.

webf.invokeModule API had been changed.

Before

webf.invokeModule(module: string, method: string, params?: Object | null, fn?: (err: Error, data: any) => void) => string;

After

webf.invokeModule(module: string, method: string, params?: any | null, fn?: (err: Error, data: any) => any) => any

1. Any JavaScript type of values can be returned.
2. The callback now can return any type of JavaScript values.

webf.addWebfModuleListener API had been changed.

Before

webf.addWebfModuleListener: (fn: (moduleName: string, event: Event, extra: string) => void) => void;

After

webf.addWebfModuleListener: (moduleName: string, fn: (event: Event, extra: any) => any) => void;

1. The listener callback now can return any type of JavaScript value to Dart.

Others

1. Remove Native WebF API (deprecated)