Multi and Auto Compressor

[ultmaster]

ddl: 4.30

After two meetings, we decide to extend ddl to 5.10

Link #3390

[J-shang]

• pruner & quantizer: if we need API to recover the compressor from a file? for simulation and export next time.
• multi-compressor:
  • naming
  • if we need support schedule pruner? (support one-shot now)
• auto-compressor
  • API naming
  • mode (use one compressor or multi-compressor)
  • default search space (it is like a tuner, support grid search now)
  • what should we show to user (config_list, result and what?)