new feature: s3 conditional copy & delete

[jachewz]

Feature Description

s3 now supports If-None-Match and If-Match headers for CopyObject and If-Match for DeleteObject. OpenDAL s3 service doesn't support this yet.

https://docs.aws.amazon.com/AmazonS3/latest/userguide/conditional-requests.html

Problem and Solution

• Add the copy_with_if_not_exists capability to s3 and implement adding the If-None-Match: * header.
• Define new copy_with_if_match capability and add to s3 and implement it
• Define new delete_with_if_match capability and add to s3 and implement it

Additional Context

No response

Are you willing to contribute to the development of this feature?

• Yes, I am willing to contribute to the development of this feature.

[Xuanwo]

Nice idea!