use recursive_mutex to protect State

use recursive_mutex to protect State

Summary:
maelstrom destructs a Promise during an indirect call from
maybeCallback and deadlocks on itself unless we use a recursive mutex.

There may be a smarter way to proceed but at the moment I can't build
and deploy a package from trunk because the service is non-functional
:-/

Test Plan:
run

```
fbconfig -r folly/wangle messaging/maelstrom
fbmake runtests
```

Reviewed By: hannesr@fb.com

Subscribers: fugalh, fsilva

FB internal diff: D1428504