Add STOCSY

[lpatiny]

Once this feature has been implemented:

#1871

We can paint the median with the STOCSY

The calculation of STOCSY requires the matrix that we previously got applying the ml-signal-processing filters. This matrix is just composed of the Y values of all the spectra (one row per spectrum).

It also requires the selection of one point in the spectrum (similar with what we do with phase correction in which PH1 requires the position of the cursor).

For this code you can get inspired by https://github.com/cheminfo/spectra-processor/blob/55b53ce69f6cc78984880bf76d7e7beb72ac4c22/src/jsgraph/getAutocorrelationChart.js#L17 but I still would like to implement mljs/spectra-processing#170