Add new MAINTAINERS to CODEOWNERS file (#4199) (#4202)

* Add new code owners
* modify changelog.md

Signed-off-by: Tao Liu <liutaoaz@amazon.com>

---------

Signed-off-by: Tao Liu <liutaoaz@amazon.com>
(cherry picked from commit bb0c98f)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: opensearch-trigger-bot[bot]

.github/CODEOWNERS

@@ -1 +1 @@
-*   @ananzh @kavilla @seanneumann @AMoo-Miki @ashwin-pc @joshuarrrr @abbyhu2000 @zengyan-amazon @kristenTian @zhongnansu @manasvinibs
+*   @ananzh @kavilla @seanneumann @AMoo-Miki @ashwin-pc @joshuarrrr @abbyhu2000 @zengyan-amazon @kristenTian @zhongnansu @manasvinibs @ZilongX @Flyingliuhub