add nf-boost

[maxulysse]

Description of feature

Add nf-boost to improve the codebase, especially when dealing with the csv creation (exec operator)

[robsyme]

Don't forget to pin the nf-boost version, as this is likely going to change very quickly.

[bentsherman]

For the exec operator, I would wait until the input/output file tracking is improved. Right now if you use it, it will work, but things like provenance tracking and automatic cleanup won't pick up the output files. It needs to be fixed in Nextflow