Description

This PR contains several PRs including some bug fix, new example addition, doc addition and refinement, new features, new tests.

Linked issue(s)/Pull request(s)

138:
- refine data push/pull in cli
112:
- add fall back function in weather download
136:
- add docs for example
144:
- switching the key and values of the handler dict which is used in the dist decorator
- add unit tests for the dist decorator
- fixed the multithreading deadlock in the maro unit test suite
147:
- remove useless reward() from Env, BE, yaml config
- refine the format & style for core & BE
157:
- add docs for AzCopy
- add dqn tests in grass/k8s mode
160, 164:
- fix the data generation description for citi bike in docs
60:
- add example/cim/gnn
166:
- fix the uppicklable bug in RL toolkit store
167:
- rename the confusing components in RL toolkit and example/cim/dqn