✨ feat(apikey): adds command to delete api keys (#1702)

We currently do not have a way to clean up api keys. There may be cases
where users of headscale may generate a lot of api keys and these may
end up accumulating in the database. This commit adds the command to
delete an api key given a prefix.

gen/openapiv2/headscale/v1/headscale.swagger.json

@@ -101,6 +101,36 @@
         ]
       }
     },
+    "/api/v1/apikey/{prefix}": {
+      "delete": {
+        "operationId": "HeadscaleService_DeleteApiKey",
+        "responses": {
+          "200": {
+            "description": "A successful response.",
+            "schema": {
+              "$ref": "#/definitions/v1DeleteApiKeyResponse"
+            }
+          },
+          "default": {
+            "description": "An unexpected error response.",
+            "schema": {
+              "$ref": "#/definitions/rpcStatus"
+            }
+          }
+        },
+        "parameters": [
+          {
+            "name": "prefix",
+            "in": "path",
+            "required": true,
+            "type": "string"
+          }
+        ],
+        "tags": [
+          "HeadscaleService"
+        ]
+      }
+    },
     "/api/v1/debug/node": {
       "post": {
         "summary": "--- Node start ---",
@@ -945,6 +975,9 @@
         }
       }
     },
+    "v1DeleteApiKeyResponse": {
+      "type": "object"
+    },
     "v1DeleteNodeResponse": {
       "type": "object"
     },