Controller name customization

[IPdotSetAF]

Added ImageController name customization.

there is also a problem with the last update (RouteTemplate):

• Swagger loads with errors.
• The solution is to use Swashbuckle.AspNetCore.SwaggerGen.ConventionalRouting Nuget to map Conventionally added endpoints to swagger.

I can also implement that in this PR if Its fine with you.

[what-the-diff]

PR Summary

• Added Dynamic Control of Image Controller's Name Template
  A new method, WithCaptchaImageControllerNameTemplate, has been incorporated into the DNTCaptchaOptions class. This enhancement enables the image controller's name template to be adjusted on the fly during program operation.

• Renamed Class Responsible for Routing
  The former DynamicRoutingControllerModelConvention class has been renamed to ControllerRoutingConvention. This change brings more clarity to the class's function in the DNTCaptcha.Core namespace, which relates to routing controllers.

• Updated Extension Method with New Class
  The CaptchaServiceCollectionExtensions.cs file was updated to utilize the renamed ControllerRoutingConvention class in its AddDNTCaptcha method, further integrating the new class name into the code.

• Additional Features for Dynamic Name Template Changes
  The ControllerRoutingConvention.cs file was amended to include a new method, ApplyNewNameDynamically. This allows for dynamic changes to the name template in the controller model, providing more flexibility in how controllers are named during runtime.

• Implementation of New Name Template Approach
  Also in the ControllerRoutingConvention.cs file, the new name template has been applied in the ApplyNewNameDynamically method, sealing its functionality in the overall system.

[IPdotSetAF]

I Found out that there is also another error in the DNTCaptchaApiProvider that i will fix shortly (actionUrl is null).