[Generation] Create configuration path constant and method retriever

[bohdan-harniuk]

We should be able to get config path constant and method if it already exists in the target configuration model.

Input:

1. target path information object
2. configuration model object (PhpClass)

Output:

Target path and method if it already exists.

Acceptance Criteria:

• it should be covered by test case.

Additional context

Mainline branch: mainline/generate-configuration-model

[m2-assistant[bot]]

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

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