Move networking related API configuration to a top level networking key

[deliahu]

Description

networking:
    endpoint: <string>
    local_port: <int>
    api_gateway: public|off

Blocked on #1077

TODO

api_gateway key should not print for local apis

Fix UserStr(); this needs to move and be smarter:

		if api.Networking != nil {
			sb.WriteString(fmt.Sprintf("%s:\n", NetworkingKey))
			sb.WriteString(s.Indent(api.Networking.UserStr(), "  "))
		}

[Allison12345]

123

来自GitHub小程序客户端：