Allow finding operations from multiple directories

[alikhosravidev]

This PR is a solution for this ISSUE

This possibility is very useful in the modular development process.

For example, in service providers, other folders can be introduced to the package

OneTimeOperationManager::loadOperationsFrom(base_path('modules/User/Operations'));

[dev-databee]

This PR needs more changes. A new function is introduced, but there is no point merging the code yet, without implementing the corresponding code in the commands.