Tracking issue for data collector sketching

[zzylol]

• Benchmark datasets for data collector sketching use case #47
• Collector has 3 types of sketch aggregations. #49
• [Discussion] How to design the control plane? #36
• MVP demo: test-first validation of ASAPCollector + ASAPQuery-backend #46
• Connecting DataCollector and ASAPQuery #39
• distributed SDKs -> 1 collector, distributed collectors #45
• Add delta sketch for SDK-collector to reduce transmission bandwidth #62