Migrate config to KV data format (#8392)

- adding oauth support to MinIO browser (#8400) by @kanagaraj
- supports multi-line get/set/del for all config fields
- add support for comments, allow toggle
- add extensive validation of config before saving
- support MinIO browser to support proper claims, using STS tokens
- env support for all config parameters, legacy envs are also
  supported with all documentation now pointing to latest ENVs
- preserve accessKey/secretKey from FS mode setups
- add history support implements three APIs
  - ClearHistory
  - RestoreHistory
  - ListHistory
- add help command support for each config parameters
- all the bug fixes after migration to KV, and other bug
  fixes encountered during testing.

browser/app/less/inc/login.less

@@ -95,6 +95,40 @@
     }
 }
 
+.openid-login {
+    margin-top: 30px;
+}
+
+.openid-btn {
+    display: inline-block;
+    margin-top: 30px;
+    border-width: 1px;
+    border-style: solid;
+    opacity: 0.6;
+    font-size: 14px;
+    &:hover {
+        color: @link-color;
+        opacity: 1;
+    }
+}
+
+.or {
+    display:flex;
+    justify-content:center;
+    align-items: center;
+    color:grey;
+  }
+  
+.or:after,
+.or:before {
+    content: "";
+    display: block;
+    background: grey;
+    width: 10px;
+    height: 1px;
+    margin: 0 10px;
+}
+
 /*------------------------------
     Chrome autofill fix
 -------------------------------*/