Add support for RNAseq data

[priyanka-surana]

Description of feature

Add subworkflow to align RNAseq data using STAR. Can be borrowed from nf-core/rnaseq.

[tkchafin]

Just adding a note that @reichan1998 had asked how we want to designate an input as rnaseq -- I suggested using the library column (last column in samplesheet) e.g., with "rnaseq" for now, but I will check this doesn't conflict with any established practice we might have. (Also will check how these end up being designated in the metadata for our internal system)

[muffato]

Internally, i.e. on disk, we only call rna-seq what comes from Illumina. We call PacBio-based transcriptomic data iso-seq.

Can we reuse those two terms in the datatype column ?