GitLab

* Support custom output directory.
* Update document.

__Major Revision__

* Support lazy import.
* Not importing benchmarks when running `help`, `version`, `deploy` commands, etc.

Update logger class.
* add file handler along with stream handler
* add colored formatter

Use omegaconf to replace hydra for configuration system:
* remove hydra
* use omegaconf to merge configurations

- Add CLI commands
  * sb version
  * sb deploy
  * sb exec
  * sb run
- Add interface with executor and runner
- Add cli test cases

* benchmarks init.
Co-authored-by: Guoshuai Zhao <guzhao@microsoft.com>