Added endpoint and versions attributes to KMS details (#17350)

Now it would list details of all KMS instances with additional
attributes `endpoint` and `version`. In the case of k8s-based
deployment the list would consist of a single entry.

Signed-off-by: Shubhendu Ram Tripathi <shubhendu@minio.io>

internal/kms/single-key.go

@@ -303,6 +303,13 @@ func (kms secretKey) DecryptAll(_ context.Context, keyID string, ciphertexts [][
 	return plaintexts, nil
 }
 
+// Verify verifies all KMS endpoints and returns details
+func (kms secretKey) Verify(cxt context.Context) []VerifyResult {
+	return []VerifyResult{
+		{Endpoint: "self"},
+	}
+}
+
 type encryptedKey struct {
 	Algorithm string `json:"aead"`
 	IV        []byte `json:"iv"`