Add new HasTrait/NotHasTrait Rules

[borisson]

Feature Request

I would like to be able to ensure that all our tests use the DatabaseTransactions trait in Laravel and that we are not using RefreshDatabase.

Q	A
New Feature	yes
RFC	yes/no
BC Break	no

Summary

$rules[] = Rule::allClasses()
    ->that(new ResideInOneOfTheseNamespaces('Tests\Feature'))
    ->should(new HaveTrait(DatabaseTransactions::class))
    ->because('We want all Feature tests to run transactions');

$rules[] = Rule::allClasses()
    ->that(new ResideInOneOfTheseNamespaces('Tests\Feature'))
    ->should(new NotHaveTrait(RefreshDatabase::class))
    ->because('We want all Feature tests to never refresh the database for performance reasons');

This should all us to be strict about the type of traits that are implemented.
I think we could also use this to enforce uuids on class (by adding HaveTrait(HasUuid::class) as a rule.