feat: improve contours caching calculation

[lpatiny]

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[lpatiny]

@hamed-musallam This is the POC of the cache. I just quickly did it as a global variable but it should of course be done at the level of each spectra using I guess a useRef.

I also did a small fix in ml-conrec to improve performances when nothing should be calculated.
@hamed-musallam Could you take over this PR or use it in the other PR ?
You can also be interesping to keep an eye on the memory using a logger.trace info with the total sum of all the lines in the cache.

Once done we will ask Michael to check if it is ok.

[lpatiny]

If a check the size of the cache

  for (const level of _range) {
    console.log(level, cache.has(level), cache.size);
    if (cache.has(level)) {

I read 414. There could be an issue with rounding calculating the different levels ? I think calculate the possible levels should be done once for ever per spectrum to avoid this issue.

This was done with 2D cosy