FIX-#6687: Explicitly add users to CODEOWNERS (#6688)

Signed-off-by: Devin Petersohn <devin.petersohn@gmail.com>

CODEOWNERS

@@ -1,8 +1,8 @@
 # These owners will be the default owners for everything in
 # the repo unless a later match takes precedence,
-*    @modin-project/modin-core
+*    @modin-project/modin-core @devin-petersohn @mvashishtha @RehanSD @YarShev @vnlitvinov @anmyachev @dchigarev
 
 # These owners will review everything in the HDK engine component
 # of Modin.
-/modin/experimental/core/storage_formats/hdk/**    @modin-project/modin-hdk
-/modin/experimental/core/execution/native/implementations/hdk_on_native/**    @modin-project/modin-hdk
+/modin/experimental/core/storage_formats/hdk/**    @modin-project/modin-hdk @aregm @gshimansky @ienkovich @Garra1980 @YarShev @vnlitvinov @anmyachev @dchigarev @AndreyPavlenko
+/modin/experimental/core/execution/native/implementations/hdk_on_native/**    @modin-project/modin-hdk @aregm @gshimansky @ienkovich @Garra1980 @YarShev @vnlitvinov @anmyachev @dchigarev @AndreyPavlenko