Tracking issues of migrate to multipart uploads write

[Xuanwo]

#2699 adds a new internal trait to make it much easier to implement Write based on mulitpart uploads API. This issue is used to track the progress of migrating multipart uploads wirte.

Notes

Please take s3 service as an example:

• Remove internal fields like buffer, buffer_size, parts
• Implement API required by MultipartUploadWrite

Services

• s3
• cos: migrate to multipart uploads write #2701
• obs: migrate to multipart uploads write #2702
• oss: migrate to multipart uploads write #2703
• wasabi: migrate to multipart uploads write #2704