Computation of reconstruction errors for vector compressors

[marianotepper]

Given a vector quantizer, this PR introduces mechanisms to compute the reconstruction error for samples of vectors. The reconstruction error is basically the mean squared error (MSE) for each vector. This PR is part of #565.

For using the MSE, we need to consider that the norm of the vector will influence the MSE, so users might want to consider normalizing the errors.

[github-actions]

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[marianotepper]

The test failures are coming from somewhere else. The code in the PR seems to be sound. Edit: linking the corresponding issue #568