Report EICs characteristics

Users may visualize extracted ion chromatograms.
It would be useful to have the characteristics of the EIC automatically reported in a table: retention time at peak maximum, FWHM, area.
This is especially useful for analysis where a chromatogram peak picking is not possible (ex: SEC or IMS data).
(A determination of FWHM from a gaussian fit would be even better.)

The issue does not name a file, test, or entry point. Start by tracing how extracted ion chromatograms are generated and displayed, then identify where a table of retention time at peak maximum, FWHM, and area belongs. Done means these characteristics are reported for EICs; Gaussian-fit FWHM is described as an optional improvement.

Written by the indexing model from the issue text.