Create and add custom table column types outside of the bundle

[flagbird]

Projects that are using our bundle can have a requirement to a new column type or one that is too close to a customer's domain than that it should be added to the bundle itself, but rather be extended on the project's side that uses the bundle.

It should be able to add a new column type and its configuration with the help of a requirejs.yml and a config entry to add new types into a column type registry. From the type registry the column types of the bundle's and the external projects will be loaded and can be added to the reference table attributes.