Need a load balancing policy that takes the server node's latency into account

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Hi, it looks the gocql driver has never include a load balancing policy that takes in the server node's latency into account, like the old [LatencyAwarePolicy](https://github.com/apache/cassandra-java-driver/blob/3.x/driver-core/src/main/java/com/datastax/driver/core/policies/LatencyAwarePolicy.java) in the cassandra-java-driver 3.x, now in the latest cassandra-java-driver 4.x there is a separate [LatencySensitiveLoadBalancingPolicy](https://github.com/datastax/java-driver-policies/blob/main/src/main/java/com/datastax/oss/driver/internal/core/loadbalancing/LatencySensitiveLoadBalancingPolicy.java) which adds the latency sensitivity in the client side based on the [DefaultLoadBalancingPolicy](https://github.com/apache/cassandra-java-driver/blob/4.x/core/src/main/java/com/datastax/oss/driver/internal/core/loadbalancing/DefaultLoadBalancingPolicy.java), wondering is it ok for gocql to add the similar counterpart because this can add some smartness in the client to temporarily avoid the server node(s) with high latencies, thanks!

Compare the referenced LatencyAwarePolicy, LatencySensitiveLoadBalancingPolicy, and DefaultLoadBalancingPolicy implementations first, then locate the GoCQL driver's existing load-balancing policy entry points. The issue names no GoCQL files or tests, so the policy behavior, scope, and validation needed for “done” must be agreed before implementation.

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