refactor 'view' object

[hamed-musallam]

          > Ok, then we should have 3 objects

No, we should have everything inside of view:

view: {
  nuclei1D: { // Record<string, ViewNuclei1D>
    '1H': {},
    '13C': {},
  },
  nuclei2D: { // Record<string, ViewNuclei2D>
    '1H,1H': {},
  },
  spectra1D: { // Record<string, ViewSpectra1D>
    uuid1: {},
    uuid2: {},
  },
  spectra2D: { // Record<string, ViewSpectra2D>
    uuid3: {},
    uuid4: {},
  },
  prop1, // other settings that don't depend on nucleus or spectrum
  prop2,
}

Originally posted by @targos in #2135 (comment)