- [x] I have searched the [issues](https://github.com/apache/dubbo/issues) of this repository and believe that this is not a duplicate.
- [x] I have checked the [FAQ](https://github.com/apache/dubbo/blob/master/FAQ.md) of this repository and believe that this is not a duplicate.

Because of TripleClientHandler working in a new thread, The line `url.getServiceMode`  doesn't work in TripleClientHandler with InstanceAddressURL when we try to use application-service-discovery.
```java
// => org.apache.dubbo.rpc.protocol.tri.TripleClientHandler#writeRequest
private void writeRequest(ChannelHandlerContext ctx, final Request req, final ChannelPromise promise) {
    final RpcInvocation inv = (RpcInvocation) req.getData();
    final URL url = inv.getInvoker().getUrl();
    // Here will throw NPE
    ConsumerModel consumerModel = (ConsumerModel) url.getServiceModel();
    // ......
}
```

See InstanceAddressURL:
```java
// => org.apache.dubbo.registry.client.InstanceAddressURL#getServiceModel
public ServiceModel getServiceModel() {
    return RpcContext.getServiceContext().getConsumerUrl().getServiceModel();
}

// => org.apache.dubbo.rpc.RpcContext
private static final InternalThreadLocal<RpcServiceContext> SERVICE_CONTEXT = new InternalThreadLocal<RpcServiceContext>() {
    @Override
    protected RpcServiceContext initialValue() {
        return new RpcServiceContext();
    }
};
```

private FrameworkModel frameworkModel;
    public TripleClientHandler(FrameworkModel frameworkModel) {
        this.frameworkModel = frameworkModel;
    }
    @Override
    public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
        if (msg instanceof Request) {
            writeRequest(ctx, (Request) msg, promise);
        } else {
            super.write(ctx, msg, promise);
        }
    }
    @Override
    public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
        if (msg instanceof Http2SettingsFrame) {
            
        } else if (msg instanceof Http2GoAwayFrame) {
            final ConnectionHandler connectionHandler = ctx.pipeline().get(ConnectionHandler.class);
            connectionHandler.onGoAway(ctx.channel());
            ReferenceCountUtil.release(msg);
        } else {
            ReferenceCountUtil.release(msg);
        }
    }
    private void writeRequest(ChannelHandlerContext ctx, final Request req, final ChannelPromise promise) {
        final RpcInvocation inv = (RpcInvocation) req.getData();
        final URL url = inv.getInvoker().getUrl();