Implement module name validation in 'Create a plugin' and 'New module' dialog

[drpayyne]

Describe the bug

To implement module existence validation for the field Target Module in the following scenarios

• Create a plugin dialog
• Create an observer dialog
• New module dialog

This was implemented in the old way and removed as part of #324 and #318, respectively, as its not directly possible using annotations. More info at #324 (comment).

Expected behavior

Target module field is validated using the list of indexed modules in the Magento 2 project

[m2-assistant]

Hi @drpayyne. Thank you for your report.
To help us process this issue please make sure that you provided sufficient information.

Please, add a comment to assign the issue: @magento I am working on this

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[drpayyne]

Closing with a better approach explained in comment: #326 (comment)

[VitaliyBoyko]

We can't use a simple Combobox for a modules list. It's inconvenient.

[drpayyne]

I understand @VitaliyBoyko, thanks. In that case, would it be better to create a new rule to validate target module fields? It would implement same logic of getting list of modules in current project and checking the existence of the value in the module list, but inside a rule so that annotations can be used and it can be reused.

[drpayyne]

I proposed yet another solution in #339. Please check, @VitaliyBoyko.

[drpayyne]

@magento I am working on this

[drpayyne]

PR is merged (#358), hence closing.