Adding specialization simulation middleware

[kshyju]

Adding code to simulate placeholder and specialization locallly.
Added 2 new configurations "DebugPlaceholder" and "ReleasePlaceholder". When building the code using any of this configurations, the necessary code to simulate placeholder & specialization will be included in the compilation.

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• My changes do not require documentation changes
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• I have added all required tests (Unit tests, E2E tests)

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