Add customizer support for OpenSCAD

This also includes sending metadata and part of the concatenated gzip,
not in the s3 metadata as that has a 2kb limit.

Resolves #320

app/web/src/helpers/cadPackages/index.ts

@@ -1,7 +1,7 @@
 import { DefaultKernelExport } from './common'
 import type { CadPackage } from 'src/helpers/hooks/useIdeState'
 
-import openscad from './openScadController'
+import openscad from './openScad/openScadController'
 import cadquery from './cadQueryController'
 import jscad from './jsCad/jsCadController'