feat: Add support for subdomains in newFactory method (#29)

[jaspertey]

• Add test coverage
• Refine and simplify where possible

Added

• Formal support for subdomains (nested domains). For example, to generate model Domain\Reporting\Internal\Models\InvoiceReport, the domain argument can be specified in any of the following ways:
  • ddd:model Reporting\\Internal InvoiceReport
  • ddd:model Reporting/Internal InvoiceReport
  • ddd:model Reporting.Internal InvoiceReport
• Implement abstract Lunarstorm\LaravelDDD\Factories\DomainFactory extension of Illuminate\Database\Eloquent\Factories\Factory:
  • Implements DomainFactory::resolveFactoryName() to resolve the corresponding factory for a domain model.
  • Will resolve the correct factory if the model belongs to a subdomain; Domain\Reporting\Internal\Models\InvoiceReport will correctly resolve to Database\Factories\Reporting\Internal\InvoiceReportFactory.

Changed

• Default base model implementation in base-model.php.stub now uses using DomainFactory::factoryForModel() inside the newFactory method to resolve the model factory.