chore: update CODEOWNERS for proper ownership (#1116)

Author: NGL321

.github/CODEOWNERS

@@ -8,3 +8,17 @@
 # @See https://help.github.com/articles/about-codeowners/
 
 *                               @aws/aws-cdk-team
+/packages/jsii-kernel           @aws/aws-cdk-team @RomainMuller
+/packages/jsii                  @aws/aws-cdk-team @RomainMuller
+/packages/@jsii/runtime         @aws/aws-cdk-team @MrArnoldPalmer
+/packages/@jsii/kernel          @aws/aws-cdk-team @RomainMuller
+/packages/@jsii/dotnet*         @aws/aws-cdk-team @MrArnoldPalmer
+/packages/@jsii/java*           @aws/aws-cdk-team @RomainMuller
+/packages/@jsii/python*         @aws/aws-cdk-team @MrArnoldPalmer
+/pacakges/jsii-diff             @aws/aws-cdk-team @MrArnoldPalmer
+/packages/jsii-runtime          @aws/aws-cdk-team @MrArnoldPalmer
+/packages/jsii-reflect          @aws/aws-cdk-team @MrArnoldPalmer
+/packages/jsii-rosetta          @aws/aws-cdk-team @MrArnoldPalmer
+/packages/jsii-spec             @aws/aws-cdk-team @MrArnoldPalmer
+/packages/jsii-pacmak           @aws/aws-cdk-team @MrArnoldPalmer
+/packages/codemaker             @aws/aws-cdk-team @MrArnoldPalmer