Enable Kernels to be built on top of kernlSpec arguments (#210)

* Enable Kernels to be built on top of kernlSpec arguments

* apply suggestion

* better formatting

* Update packages/xeus/src/worker.ts

Co-authored-by: martinRenou <[email protected]>

---------

Co-authored-by: martinRenou <[email protected]>

Author: anutosh491

packages/xeus/src/worker.ts

@@ -207,8 +207,10 @@ export abstract class XeusRemoteKernel {
       }
 
       this._initializeStdin(baseUrl, browsingContextId);
-
-      rawXKernel = new globalThis.Module.xkernel();
+      // backward compatibility: Checking if the kernel constructor takes argument or not
+      rawXKernel = globalThis.Module.xkernel.length
+        ? new globalThis.Module.xkernel(kernelSpec.argv)
+        : new globalThis.Module.xkernel();
       rawXServer = rawXKernel.get_server();
       if (!rawXServer) {
         this._logger.error('Failed to start kernel!');