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/object-api-utils_test.go

@@ -25,6 +25,7 @@ import (
 	"testing"
 
 	"github.com/klauspost/compress/s2"
+	"github.com/minio/minio/cmd/config/compress"
 	"github.com/minio/minio/cmd/crypto"
 )
 
@@ -417,9 +418,9 @@ func TestExcludeForCompression(t *testing.T) {
 		},
 	}
 	for i, test := range testCases {
-		globalIsCompressionEnabled = true
-		got := excludeForCompression(test.header, test.object)
-		globalIsCompressionEnabled = false
+		got := excludeForCompression(test.header, test.object, compress.Config{
+			Enabled: true,
+		})
 		if got != test.result {
 			t.Errorf("Test %d - expected %v but received %v",
 				i+1, test.result, got)