Feature: support rule test on edge device

[JiahangXu]

• overall docs refactor and example draft for nn_meter builder;
• change 'MON' and 'RT' more easy way to understand;
• end-to-end example for predictor builder;
• registration of backend / kernel model / fusion rules, and provide examples for them;
• check logging bug and refine it;
• complete predbuild config for several kernel predictor building;
• clear redundant tensorflow depenency;