Introduce NSwag to all modules

[gdlcf88]

• Install the NSwag.AspNetCore package to the Web project of the sample solution and change the module's configurations.
• Add [ApiExplorerSettings(GroupName = "EasyAbpMyModuleName")] attribute to the abstract class MyModuleNameController.
• Add the above changes to https://github.com/EasyAbp/EasyAbpGuide/blob/master/Getting-Start-to-Develop-Modules.md

Refer to the commit: EasyAbp/PaymentService@a4b71f2