Feature Request: Support for new API TryLock at Topo level.

[rsajwani]

Feature Description

Topo.Lock is a blocking call. When concurrent calls to lock same shard happen the client gets block until the lock releases itself or context times out. But this create an issue where a lot of clients try to acquire lock all together and result in server getting overwhelmed.

In order to avoid server getting overwhelmed we need to introduce TryLock which is non-blocking and return immediately if it cannot acquire lock instead of waiting at server.

Use Case(s)

This can be called anywhere where we are doing LockShard call.