Support for remote tier management (#12090)

With this change, MinIO's ILM supports transitioning objects to a remote tier.
This change includes support for Azure Blob Storage, AWS S3 compatible object
storage incl. MinIO and Google Cloud Storage as remote tier storage backends.

Some new additions include:

 - Admin APIs remote tier configuration management

 - Simple journal to track remote objects to be 'collected'
   This is used by object API handlers which 'mutate' object versions by
   overwriting/replacing content (Put/CopyObject) or removing the version
   itself (e.g DeleteObjectVersion).

 - Rework of previous ILM transition to fit the new model
   In the new model, a storage class (a.k.a remote tier) is defined by the
   'remote' object storage type (one of s3, azure, GCS), bucket name and a
   prefix.

* Fixed bugs, review comments, and more unit-tests

- Leverage inline small object feature
- Migrate legacy objects to the latest object format before transitioning
- Fix restore to particular version if specified
- Extend SharedDataDirCount to handle transitioned and restored objects
- Restore-object should accept version-id for version-suspended bucket (#12091)
- Check if remote tier creds have sufficient permissions
- Bonus minor fixes to existing error messages

Co-authored-by: Poorna Krishnamoorthy <poorna@minio.io>
Co-authored-by: Krishna Srinivas <krishna@minio.io>
Signed-off-by: Harshavardhana <harsha@minio.io>

cmd/api-errors.go

@@ -241,6 +241,7 @@ const (
 	ErrClientDisconnected
 	ErrOperationMaxedOut
 	ErrInvalidRequest
+	ErrTransitionStorageClassNotFoundError
 	// MinIO storage class error codes
 	ErrInvalidStorageClass
 	ErrBackendDown
@@ -943,6 +944,12 @@ var errorCodes = errorCodeMap{
 		Description:    "Object restore is already in progress",
 		HTTPStatusCode: http.StatusConflict,
 	},
+	ErrTransitionStorageClassNotFoundError: {
+		Code:           "TransitionStorageClassNotFoundError",
+		Description:    "The transition storage class was not found",
+		HTTPStatusCode: http.StatusNotFound,
+	},
+
 	/// Bucket notification related errors.
 	ErrEventNotification: {
 		Code:           "InvalidArgument",
@@ -1972,6 +1979,11 @@ func toAPIErrorCode(ctx context.Context, err error) (apiErr APIErrorCode) {
 		apiErr = ErrRemoteTargetNotVersionedError
 	case BucketReplicationSourceNotVersioned:
 		apiErr = ErrReplicationSourceNotVersionedError
+	case TransitionStorageClassNotFound:
+		apiErr = ErrTransitionStorageClassNotFoundError
+	case InvalidObjectState:
+		apiErr = ErrInvalidObjectState
+
 	case BucketQuotaExceeded:
 		apiErr = ErrAdminBucketQuotaExceeded
 	case *event.ErrInvalidEventName: