add nf-core modules test command

[grst]

Is your feature request related to a problem? Please describe

Running module tests locally requires a fairly complex command that's hard to remember, for instance

NF_CORE_MODULES_TEST=1 TMPDIR=~ PROFILE=singularity pytest --tag fastqc --symlink --keep-workflow-wd

Describe the solution you'd like

A subcommand for the nf-core tools CLI, for instance

nf-core modules test --profile singularity --tag fastqc

A Rich-based CLI asks the user what profile they would like to run with and which software to test when nf-core modules test
is executed without arguments

Additional context

Support to emit multiple versions per module required adding the NF_CORE_MODULES_TEST=1 variable, which made the
command even more complex. See https://github.com/nf-core/nf-co.re/pull/877/files

[ggabernet]

nf-core modules test NEW