Add a way to keep plugin data when uninstalling

[RomanovM]

nopCommerce version: 4.60

We need a generic way to keep plugin data when uninstalling to avoid creating such a method in each plugin.

Suggestion: https://www.nopcommerce.com/boards/topic/84184/remove-all-plugin-tables-on-plugin-uninstall-setting

[SelectSystemsInternational]

I have two settings in my Plugins

Delete Plugin Tables on Uninstall - If ticked it will delete the tables

• Does mean you need to implement Up and Down methods and check the setting before deleting tables
• Need to check if tables exisit before creating on install (which I think is standard now)

Delete Configuration Data on Uninstall - If ticked will delete the settings assicated withthe plugin

• Need to check if the settings exist before overwriting on install

If ever needed you have to option of completely unistall and delete plugin but not loose config and/or tables