marketplace: add keywords "Code", "Whisperer" #3213

Problem:
AWS Toolkit does not appear in VS marketplace searches for "Code
Whisperer" (as opposed to "CodeWhisperer"). VS marketplace limits us to
5 keywords.

Solution:
Replace other keywords with "Code" and "Whisperer".

Author: justinmk3

package.json

@@ -32,8 +32,8 @@
         "AWS",
         "CodeCatalyst",
         "CodeWhisperer",
-        "Lambda",
-        "Serverless"
+        "Code",
+        "Whisperer"
     ],
     "preview": false,
     "qna": "https://github.com/aws/aws-toolkit-vscode/issues",