Add native Oracle Cloud Objec Storage support

[Xuanwo]

Oracle has its own native API support: https://docs.oracle.com/en-us/iaas/api/#/en/objectstorage/20160918/Object/GetObject

[Xuanwo]

Auth: https://github.com/oracle/oci-go-sdk/tree/master/common/auth
Sign: https://docs.oracle.com/en-us/iaas/Content/API/Concepts/signingrequests.htm
Go SDK: https://github.com/oracle/oci-go-sdk/blob/master/common/http_signer.go

[Xuanwo]

Blocked by #2563

[Xuanwo]

No one seems interested in this. Let's just close it.

[kerryland]

Given they allow 10 TB of data egress each month at no charge, I'm definitely interested!