✨ 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.

proto/headscale/v1/apikey.proto

@@ -33,3 +33,10 @@ message ListApiKeysRequest {
 message ListApiKeysResponse {
     repeated ApiKey api_keys = 1;
 }
+
+message DeleteApiKeyRequest {
+    string prefix = 1;
+}
+
+message DeleteApiKeyResponse {
+}

proto/headscale/v1/headscale.proto

@@ -178,6 +178,12 @@ service HeadscaleService {
             get : "/api/v1/apikey"
         };
     }
+
+    rpc DeleteApiKey(DeleteApiKeyRequest) returns(DeleteApiKeyResponse) {
+        option(google.api.http) = {
+            delete : "/api/v1/apikey/{prefix}"
+        };
+    }
     // --- ApiKeys end ---
 
     // Implement Tailscale API