feat(kubernetes): add user alias (#4008)

* add kubernetes user alias (fixes #3870)

* update config schema

* sort config property alphabetically

* Update README.md

* add test-case for non-matching alias

.github/config-schema.json

@@ -767,7 +767,8 @@
         "disabled": true,
         "format": "[$symbol$context( \\($namespace\\))]($style) in ",
         "style": "cyan bold",
-        "symbol": "☸ "
+        "symbol": "☸ ",
+        "user_aliases": {}
       },
       "allOf": [
         {
@@ -3274,6 +3275,13 @@
           "additionalProperties": {
             "type": "string"
           }
+        },
+        "user_aliases": {
+          "default": {},
+          "type": "object",
+          "additionalProperties": {
+            "type": "string"
+          }
         }
       }
     },