SAM files (*.sam.bz2) as optional output of MetaPhlAn for subsequent StrainPhlAn analysis

[mr2raccoon]

Description of feature

Hey,

it would be nice to optionally have SAM files (*.sam.bz2) generated from MetaPhlAn to be able to chain StrainPhlAn after running taxprofiler for strain-level resolution.

Thank you

[jfy133]

First step: nf-core/modules#8937