github: update CODEOWNERS (tikv#6882)

ref tikv#4399

Update `CODEOWNERS` to add `/pkg/schedule/config/config.go`.

Signed-off-by: JmPotato <ghzpotato@gmail.com>

Author: JmPotato

.github/CODEOWNERS

@@ -1,5 +1,10 @@
-# Require review from domain experts when the PR modified significant config files.
+# Require review from domain experts when the PR modified significant config files
+
+/conf/config.toml @tikv/pd-configuration-reviewer
 /server/config/config.go @tikv/pd-configuration-reviewer
+/pkg/schedule/config/config.go @tikv/pd-configuration-reviewer
 /pkg/schedule/schedulers/hot_region_config.go @tikv/pd-configuration-reviewer
-/conf/config.toml @tikv/pd-configuration-reviewer
+/pkg/mcs/resourcemanager/server/config.go @tikv/pd-configuration-reviewer
+/pkg/mcs/scheduling/server/config/config.go @tikv/pd-configuration-reviewer
+/pkg/mcs/tso/server/config.go @tikv/pd-configuration-reviewer
 /metrics/grafana/pd.json @tikv/pd-configuration-reviewer