buildScripts/createComponent

while we do already have a program to create a generic class file in place => buildScripts/createClass.mjs, it would be nice to have a more specialised version just for components as well.

the new program should:

• create the JS class file (same way as createClass, we can exclude the singleton option)
• generate the theme files (src, theme-dark, theme-light)
• create a baseCls inside the JS file, which then gets used inside the scss src file
• create an example folder based on the namespace (class name)
• the example MainContainer should already import & display the new component
• the scss src file should already have a background-color & color, based on theme variables
• we need a themes build to initially render the new component correctly.
• as the last step, it could run npm run server-start and immediately show the new component inside a browser window