Add export peaks feature

[lpatiny]

In the peak tab we would need a new copy to clipboard feature:

[hamed-musallam]

@lpatiny

What is the format of the exported data?

[lpatiny]

Ideally a TSV with the columns displayed on the screen.

It will evolve later but we need to have a discussion about how we could make peak picking on 20 spectra at once.