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.

cmd/routers.go

@@ -113,7 +113,7 @@ func configureServerHandler(endpoints EndpointList) (http.Handler, error) {
 	registerMetricsRouter(router)
 
 	// Register web router when its enabled.
-	if globalIsBrowserEnabled {
+	if globalBrowserEnabled {
 		if err := registerWebRouter(router); err != nil {
 			return nil, err
 		}