Use traffic controller to manage TrafficGate and Pipeline

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Background

Currently, the architecture shows below.

It has some problems:

• TrafficGate and Pipeline have been used by multiple sources such as static config, Mesh, etc.
• No namespaces to separate.
• It's hard to do global scheduling for them.

Proposal

So we decide to use a dedicated controller to manage them. Here's the new architecture:

We got the benefits:

• Supervisor is much cleaner as managing controllers only
• More extensibility by using one core(traffic controller) and external resource users(default traffic, mesh, faas, etc).
• Data and statistics can be merged/calculated better with namespaces.