proteomicslfq to DSL2

[jpfeuffer]

Steps:

1. create (local) modules for every step in proteomicstmt for release (make sure to use the auto-generation of the templates from nf-core tools, and have a look at mhcquant which already includes some OpenMS steps)
2. copy modules to proteomicslfq and include them
3. add missing modules to proteomicslfq
4. make modules public (add test data etc.) and publish them on nf-core