Add customLLDBInitFile

[polac24]

Short description 📝

Adding new scheme (Xcode 11.4+) attribute customLLDBInitFile.
That was never included in the Release Notes (but all future Xcode versions support that), link.

Solution 📦

Test and Run actions can optionally specify customLLDBInitFile with a path to the per-project .lldbinit.

Implementation 👩‍💻👨‍💻

• Add new optional properties for TestAction and RunAction
• Write unit tests

[pepicrft]

Thanks for adding this @polac24