Support for custom CLI parameters

[tobiasqueck]

Is your feature request related to a problem? Please describe.

When I need to run e.g. ui5 serve with different configurations, I am currently forced to create multiple ui5*.yaml files. In some cases, I need exactly the same configuration except one value is different. The overhead of maintaining multiple files for that is increasing the costs of maintaining a UI5 project.

Describe the solution you'd like

Allow the usage of custom CLI parameters that are accessible in my middleware/task e.g. I would like to call ui5 serve --debug --magic 42 and in my middleware I have access to e.g. this global configuration as e.g. object

{
  debug: true
  magic: '42'
}

Describe alternatives you've considered

I could also solve the same problem, if it would also be possible to provide the configuration not as yaml but as js file. Then, I have all the flexibility needed to create inheritance between configs or custom creation of the config based on other parameters.

Additional context

No