Add setSource in stl & step plugin to fix lite deployment (#692)

* Add setSource in stl & step plugin

* Update python/jupytercad_core/src/stepplugin/model.ts

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

* iterate

---------

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

Author: arjxn-py

python/jupytercad_core/src/stepplugin/model.ts

@@ -56,6 +56,10 @@ export class JupyterCadStepDoc extends JupyterCadDoc {
     ];
   }
 
+  setSource(value: string): void {
+    this._source.insert(0, value);
+  }
+
   static create(): JupyterCadStepDoc {
     return new JupyterCadStepDoc();
   }

python/jupytercad_core/src/stlplugin/model.ts

@@ -56,6 +56,10 @@ export class JupyterCadStlDoc extends JupyterCadDoc {
     ];
   }
 
+  setSource(value: string): void {
+    this._source.insert(0, value);
+  }
+
   static create(): JupyterCadStlDoc {
     return new JupyterCadStlDoc();
   }