Add BufWriter::with_attributes and ::with_tags in object_store

[netthier]

Which issue does this PR close?

Closes #5692.

What changes are included in this PR?

This PR adds the method with_attributes to BufWriter, which allows users to set attributes on uploaded objects.

I originally intended to add with_tags as well, as both put_opts and put_multipart_opts support them, but I did not know how to retrieve tags after setting them, leaving me unable to test that method. Therefore I guess that this only closes the linked issue partially.
It also adds with_tags which does the same but for tags.

Are there any user-facing changes?

Yes, this PR introduces two new methods on BufWriter. There are no breaking changes though.

[tustvold]

how to retrieve tags after setting them, leaving me unable to test that method.

We don't expose it publicly, as there is no consistency between stores, but there is an integration test of object tagging that you could hook into

[netthier]

Could you maybe elaborate on how that hooking into could look like? If it's not too difficult I'd like to include it in this PR for completeness.

[tustvold]

https://github.com/apache/arrow-rs/blob/master/object_store/src/lib.rs#L2362 is an integration test called by both the AWS and Azure test suites, and is provided with a method for retrieving the tags for a given path.

It should just be a case of extending this integration test with your new BufWriter functionality and that should do the trick

[netthier]

I'm trying to add BufWriter to tagging, but I can't figure out how to get the Arc<dyn ObjectStore> required. tagging takes a &dyn ObjectStore, and changing the method signature so that the caller needs to pass an Arc leads to more issues...

Any idea what I could do?

EDIT: As both AmazonS3 and MicrosoftAzure have an Arc inside, I could just construct an entirely new client to wrap in an Arc. Though that's not very elegant.
EDIT 2: This is what I now pushed.