WIP: feat: add plain schema editor

[aenyway]

start of implementation

• i intended to get rid of the <CTypeEditor /> component completely, since it just is a obsolete wrapper
• instead i planned to move all the logic to <CTypeCreate />
• both <SchemaEditor /> & <PlainSchemaEditor /> only collect the user input and pass it to <CTypeCreate />
• even the error handling should be done there, so we have consistent error handling
• for this we should disable the error handling of the <SchemaEditor /> (maybe configurable, otherwise just hide it via css)
• the only error handing we might not handle in <CTypeCreate /> is the 'Invalid JSON' error of the <PlainSchemaEditor />, this one can only appear there and could be handled there