Add an endpoint for getting diagnostic info about a given lock

[inlinestyle]

It would help with debugging applications that use Lox if there were a way to check how many lock ids were checked out for a given lock.

I'm thinking something like

GET /lock?key=<my-lock-key>

That would return some JSON

{
    "heldLocks": 5
}

[thieman]

+1

[inlinestyle]

Woooo