Fixes some issues and confusion of datatable generator command

[rahulhaque]

This pull request fixes plethora of issues for the datatables:make command -

1. Fixes datatables:make command fail to generate error free classes for the following scenarios where it can't identify the model name and namespace correctly -
   • php artisan datatables:make Api/DriverDataTable
   • php artisan datatables:make Api/Driverdatatable
   • php artisan datatables:make Api/Driver
   • php artisan datatables:make Api/DriverDataTable --model=Driver
   • php artisan datatables:make Api/DriverDataTable --model=Driver --model-namespace=App\\Custom
   • php artisan datatables:make Api/DriverDataTable --builder
2. Fixes appending DataTable with mix-case or lowercase generating different class name.
3. In datatables:make command, the getModel() method was too confusing. Tried to simplify the logic and removed code duplication. Such as, there's no need to check for -
   • Existence of Models directory and
   • Root namespace when model namespace is provided by the user (either in config or in arguments).
4. Fixes where datatables:make --builder command will always fail to create HTML builder class.

[rahulhaque]

Good day @yajra. I feel like there are lot of changes within a single pull request. First I thought let's fix this portion only, then it led to another, then another, and I end up making all the changes in one commit. Also there are some changes I think related to styles that your GitHub actions identified during my first pull request. If you could manage some time to look, do suggest me any changes needed.

[yajra]

Good day @rahulhaque, no problem with the changes. Will review this as soon as I can. Thanks!

[yajra]

Released on v9.1.3, thanks a lot! 🚀