Daily bit(e) of C++ | std::lerp

Daily bit(e) of C++ #244, Linear interpolation function: std::lerp.

The std::lerp is a C++20 mathematical function that handles linear interpolation (and extrapolation) for floating-point types.

The function takes three arguments: the two boundary values and an interpolation factor. The implementation will correctly handle infinities and boundary values for the interpolation factor.

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