[Generation] Generate configuration model

[bohdan-harniuk]

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

Often we need to create some configuration models to access data from the (custom) store configurations. As for an example: \Magento\Tax\Model\Config::class.

Describe the solution you'd like (*)

Would be great to be able to generate such a configuration model based on the system.xml file.

Sub-tasks:

1. https://github.com/magento/magento2-phpstorm-plugin/issues/1162
2. https://github.com/magento/magento2-phpstorm-plugin/issues/1163
3. https://github.com/magento/magento2-phpstorm-plugin/issues/1165
4. https://github.com/magento/magento2-phpstorm-plugin/issues/1164
5. https://github.com/magento/magento2-phpstorm-plugin/issues/1167
6. https://github.com/magento/magento2-phpstorm-plugin/issues/1168
7. https://github.com/magento/magento2-phpstorm-plugin/issues/1169
8. https://github.com/magento/magento2-phpstorm-plugin/issues/1170

Additional context

Mainline branch: 4.5.0-develop

[m2-assistant[bot]]

Hi @bohdan-harniuk. Thank you for your report. To speed up processing of this issue, make sure that you provided sufficient information.

Add a comment to assign the issue: @magento I am working on this

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