post related requests

[hcfw007]

We have implemented post module, however it's not implemented in puppet-service and wechaty-grpc.
wechaty-grpc should support this feature so that puppet-service can support it too.

realted issue: wechaty/wechaty#2245

[huan]

Could you please create an issue in the Wechaty repo to list all the recent issues/PRs that you are working on?

It would be very helpful for me to have an overview of all the tasks, to improve my response time, like what I have created before in PadLocal:

• Huan's issue list puppet-padlocal#104

[hcfw007]

We have one in wechaty-puppet-wxwork. Is this one OK for you?

https://github.com/juzibot/wechaty-puppet-workpro/issues/782