Added ability to choose node during server purchase

[pteroca-com]

No description provided.

[scru-bb-y]

I dont know how far in progress this feature is and how it should end up working, but I just wanted to drop an idea about this:

I think it would be best to not make the selection based on the specific nodes that have been configured in the product settings, but instead make it base on the locations from Pterodactyl.
So as the admin, instead of setting the nodes in the product connections tab inside the product settings, let them choose one ore multiple locations that are pulled from Pterodactyl. Users can then select these locations during checkout and PteroCA will automatically deploy the server on a free node within that location (maybe to the one with less resources allocated).
This way you would support having multiple nodes in the same location, as that wouldnt be the case if you only work with the nodes itself.