[FEATURE] (Optional) Additional filtering / contamination filtering steps

[apeltzer]

nf-core/smrnaseq feature request

Is your feature request related to a problem? Please describe

There are currently (no/few?) filtering / contamination filtering steps implemented (for trna, rrna, cdna,ncrna, pirna, ...) - we have some modules available for this and would like to contribute these.

Describe the solution you'd like

See above - making this available for everyone to optionally filter contaminants out.

Describe alternatives you've considered

Keeping these out ;-)