[feat] Implementing SmoothAP loss
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Hi,
this PR implements the loss presented in the paper Smooth-AP: Smoothing the Path Towards Large-Scale Image Retrieval. The default hyperparameters are chosen using the values that resemble a heavyside step function, as suggested by the authors.
Aside from the implementation, I also added a section in the docs and a test case which uses the original implementation to calculate the loss.