lifecycle: Support tags with special characters (#14906)

Object tags can have special characters such as whitespace. However
the current code doesn't properly consider those characters while
evaluating the lifecycle document.

ObjectInfo.UserTags contains an url encoded form of object tags
(e.g. key+1=val)

This commit fixes the issue by using the tags package to parse object tags.

internal/bucket/lifecycle/lifecycle_test.go

@@ -325,6 +325,14 @@ func TestComputeActions(t *testing.T) {
 			objectModTime:  time.Now().UTC().Add(-24 * time.Hour), // Created 1 day ago
 			expectedAction: DeleteAction,
 		},
+		// Should remove (Tags with encoded chars)
+		{
+			inputConfig:    `<LifecycleConfiguration><Rule><Filter><And><Tag><Key>factory</Key><Value>true</Value></Tag><Tag><Key>store forever</Key><Value>false</Value></Tag></And></Filter><Status>Enabled</Status><Expiration><Date>` + time.Now().Truncate(24*time.Hour).UTC().Add(-24*time.Hour).Format(time.RFC3339) + `</Date></Expiration></Rule></LifecycleConfiguration>`,
+			objectName:     "fooobject",
+			objectTags:     "store+forever=false&factory=true",
+			objectModTime:  time.Now().UTC().Add(-24 * time.Hour), // Created 1 day ago
+			expectedAction: DeleteAction,
+		},
 
 		// Should not remove (Tags don't match)
 		{