rgw/admin: support new-bucket-name for LinkBucket

[sj14]

• Separate input structs for link and unlink operation.
• Adding the new-bucket-name parameter to BucketLinkInput which allows renaming a specific bucket.

Checklist

• Added tests for features and functional changes
• Public functions and types are documented
• Standard formatting is applied to Go code
• Is this a new API? Added a new file that begins with //go:build ceph_preview
• Ran make api-update to record new APIs

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[anoopcs9]

lgtm, thanks.

[phlogistonjohn]

Generally LGTM, but I certainly find the rgw stuff my weakest go-ceph area.
@anoopcs9 do you want to try and take #1051 first and then retest this one with a "fixed" CI first?

[anoopcs9]

Generally LGTM, but I certainly find the rgw stuff my weakest go-ceph area.

Adding our usual goto as an additional reviewer 😄

@anoopcs9 do you want to try and take #1051 first and then retest this one with a "fixed" CI first?

Sure.

[anoopcs9]

@Mergifyio rebase

[mergify]

rebase

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