Add ahkcs as maintainer (#5223)

Signed-off-by: Eric Wei <mengwei.eric@gmail.com>

Author: mengweieric

.github/CODEOWNERS

@@ -1,2 +1,2 @@
 # This should match the owning team set up in https://github.com/orgs/opensearch-project/teams
-*   @ps48 @kavithacm @derek-ho @joshuali925 @dai-chen @YANG-DB @mengweieric @vamsimanohar @swiddis @penghuo @seankao-az @MaxKsyunz @Yury-Fridlyand @anirudha @forestmvey @acarbonetto @GumpacG @ykmr1224 @LantaoJin @noCharger @qianheng-aws @yuancu @RyanL1997
+*   @ps48 @kavithacm @derek-ho @joshuali925 @dai-chen @YANG-DB @mengweieric @vamsimanohar @swiddis @penghuo @seankao-az @MaxKsyunz @Yury-Fridlyand @anirudha @forestmvey @acarbonetto @GumpacG @ykmr1224 @LantaoJin @noCharger @qianheng-aws @yuancu @RyanL1997 @ahkcs

MAINTAINERS.md

@@ -24,6 +24,7 @@ This document contains a list of maintainers in this repo. See [opensearch-proje
 | Heng Qian         | [qianheng-aws](https://github.com/qianheng-aws)     | Amazon      |
 | Yuanchun Shen     | [yuancu](https://github.com/yuancu)                 | Amazon      |
 | Ryan Liang        | [RyanL1997](https://github.com/RyanL1997)           | Amazon      |
+| Kai Huang         | [ahkcs](https://github.com/ahkcs)                   | Amazon      |
 | Max Ksyunz        | [MaxKsyunz](https://github.com/MaxKsyunz)           | Improving   |
 | Yury Fridlyand    | [Yury-Fridlyand](https://github.com/Yury-Fridlyand) | Improving   |
 | Andrew Carbonetto | [acarbonetto](https://github.com/acarbonetto)       | Improving   |