Add load balancing assertion to the stress test #268
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It will now track count of active (checked out of the pool) resources per key. Where key is a server address in the driver. Counter is incremented when resource is acquired from the pool and decremented when resource is released back to the pool. Also added JSDocs in the `Pool` class.
This replaces the existing round-robin. It gives us better performance
with clusters composed of different machine capacities.
Lease connected load balancing strategy selects start index in
round-robin fashion to avoid always selecting same machine when cluster
does not have any running transactions or all machines have same number
of active connections.
It is possible to go back to previous round-robin load balancing
strategy using an experimental config setting:
```
{loadBalancingStrategy: 'round_robin'}
```
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To make sure both followers and read replicas serve similar amount of read queries.
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Based on #267