update subworkflows install so it installs also imported modules and subworkflows

[mirpedrol]

The command nf-core subworkflows install installs also the modules and subworkflows imported in the subworkflow.

To deal with already installed modules, I had to add a question asking if the modules should be re-installed with --force. Because subworkflows will need to work with the last version of the modules, the modules must be re-installed (aka. updated), otherwise the installation fails.

🧠 what will happen when installing an older version of a subworkflow?

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[yuukiiwa]

Thanks, @mirpedrol!! Looks good to me!

[codecov]

Codecov Report

Merging #1904 (1feb390) into dev (8aeb965) will decrease coverage by 0.26%.
The diff coverage is 12.50%.

@@            Coverage Diff             @@
##              dev    #1904      +/-   ##
==========================================
- Coverage   60.30%   60.04%   -0.27%     
==========================================
  Files          37       37              
  Lines        4608     4635      +27     
==========================================
+ Hits         2779     2783       +4     
- Misses       1829     1852      +23     

Impacted Files	Coverage Δ
nf_core/subworkflows/install.py	14.39% <12.50%> (+0.10%)	⬆️

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