service: Add Baidu Cloud Storage (BOS) Support

[Xuanwo]

Baidu Object Storage (BOS)

BOS provides a stable, safe, efficient, and scalable cloud storage service. You can store any quantity and form of unstructured data in BOS, with managing and processing data. BOS supports multiple storage types, such as Standard, Infrequent Storage, Cold, and Archive, to meet the storage requirements of multiple scenarios.

BOS supports the S3 API, but also has its own native API (and baidu cloud's own IAM infra).

References:

• Auth: https://cloud.baidu.com/doc/Reference/s/njwvz1yfu

[parkma99]

/assign

[suyanhanx]

/assign

Have fun!

[GG2002]

/assign

hello, are you working at this issue now? I'm interested in this issue, too. If you don't mind, I wanna try this issue:)