GitLab

**Description**
Add Executor and Benchmarks design doc

**Major Revision**
- Add Executor design doc
- Add Benchmarks design doc

__Description__
Cherry-pick bug fixes from v0.2.1 to main.

__Major Revisions__
* Fix bug of VGG models failed on A100 GPU with batch_size=128.
* Fix Ansible connection issue when running in localhost.
* Update version in packages and docs.

**Description**
Add result contributing rules

**Description**
Add release process document.

Update README and version for v0.2 release.

Support `--host-list` for deploy and run commands.

Before this change, an inventory file is needed to use `sb deploy/run`.
Now, `--host-list localhost` or `-l localhost` is sufficient for quick try.

* Support custom output directory.
* Update document.

* Add introduction and release documents.
* Fix some typos in documents.

Update SuperBench documents.