Roadmap to v0.1

[Xuanwo]

In order to make opendal ready for v0.1, we need the following works:

NOTE: we are on the migration from databend common-dal2 to opendal. So there are some old issues referred from databend repo here. But all new opendal only issues should be submitted here.

• dal: Add integration tests target on production services #8
• benches: Implement benches for read op #26
• docs about how to use and how to contribute
• *: Implement RFC-0041 Object Native API #35
• Auto get the bucket region if the region is empty #37
• backend/s3: Remove the requirement for region #56

[Xuanwo]

We are ready for the v0.1 release, let's refine the test a bit.

[Xuanwo]

Implemented in #60, Let's go for the v0.1

[Xuanwo]

v0.1 release!