Move "forums" functionality to plugins

[danielnutu]

Idon't know if it's a good idea or not, from a "bloat-ware" perspective and a performance perspective, but can forums be moved to plugins?

Probably add new widget zones used for menus etc.

Similar to https://github.com/nopSolutions/nopCommerce/issues/7340 and https://github.com/nopSolutions/nopCommerce/issues/7341 and https://github.com/nopSolutions/nopCommerce/issues/7368