new feature: Add if-match & if-none-match support for reader

[Xuanwo]

Feature Description

OpenDAL supports read_with(path).if_match(etag) but not reader_with(path).if_match(etag), it will be great if we can support it.

Problem and Solution

reader could read diffent range of file, so the etag may need to pass while perform real reading IO. The API should be carefully designed.

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.

[XmchxUp]

Hi, I am trying to implement it.

[Xuanwo]

Hi, I am trying to implement it.

Thant's great! Since this will affect our public API, would you like to propose an RFC first?