[WebGPU] ShaderModule should log source on failed compilation

https://bugs.webkit.org/show_bug.cgi?id=266639
<radar://119870883>

Reviewed by Tadeu Zagallo.

To help triage failures, it is beneficial to see not only
the error but the source as finding the source can be non-trivial.

* Source/WebGPU/WebGPU/ShaderModule.mm:
(WebGPU::Device::createShaderModule):

Canonical link: https://commits.webkit.org/272514@main

Source/WebGPU/WebGPU/ShaderModule.mm

@@ -136,6 +136,7 @@
             message.print("\n"_s, error);
         }
         dataLogLn(message.toString());
+        dataLogLn(fromAPI(shaderModuleParameters->wgsl.code));
         generateAValidationError(message.toString());
         return ShaderModule::createInvalid(*this, failedCheck);
     }