[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. [Generation] Create configuration model generator #1162
2. [Generation] Create configuration path constant and method generator(s) #1163
3. [Generation] Create configuration path information indexer #1165
4. [Generation] Create configuration path information parser #1164
5. [Generation] Create configuration path constant and method location finder/resolver #1167
6. [Generation] Create configuration path constant and method retriever #1168
7. [Generation] Create configuration path constant and method persisting (insertion) service  #1169
8. [Generation] Create configuration model generation action and dialog window #1170

Additional context

Mainline branch: 4.5.0-develop

[m2-assistant]

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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