Add more attributes to object_store::Attribute

[netthier]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

I want to set attribute headers currently not included in Attribute but supported by providers such as GCP, AWS and Azure, such as Content-Disposition.

Describe the solution you'd like

More variants should be added to object_store::Attribute and implemented accordingly.
Specifically, I think Content-Disposition, Content-Encoding and Content-Language should be added, as they're well-supported.

Describe alternatives you've considered

It's possible to set the same headers using default headers per-client, but that is unwieldy if one wants to set these headers dynamically.

Additional context

https://cloud.google.com/storage/docs/metadata#content-disposition (and following)
https://learn.microsoft.com/en-us/rest/api/storageservices/put-blob?tabs=microsoft-entra-id#request-headers-all-blob-types
https://docs.aws.amazon.com/AmazonS3/latest/API/API_PutObject.html

[tustvold]

label_issue.py automatically added labels {'object-store'} from #5690