added isNotNull() function to enhance readability and alternative to standard null check
#5405
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This PR introduces the isNotNull extension function, which improves Kotlin code readability and enables smart casting by leveraging Kotlin contracts.
Key Features:
Provides a more expressive alternative to the standard this != null null-check.
Utilizes Kotlin contracts to inform the compiler about the nullability of the receiver, allowing safe smart casting.
Enhances code clarity, making null-safety checks more readable and intuitive.