Support for topology replica calculation.

[yinsenyan]

What would you like to be added:

Predictor and Scheduler support calculate replicas by topology

Why is this needed:

In most cases, there are multiple topological domains in the cluster, and this needs to be considered during scheduling in order to achieve optimal resource utilization.

[yinsenyan]

Some jobs

• 1. Implementing an interface for the Predictor to calculate the maximum number of replicas that can be accommodated based on the topological domain, like this
• 2. Implementing an assigner plugin for the scheduler to calculate the number of replicas based on the topological domain
• 3. Enabling features by feature-gates