[WIP] Add module connectivity visualization

[ThoumyreStanislas]

Describe your changes

new module for visualize connectivity matrix, The module is a copy of the module in nf-pediatric created by @gagnonanthony .

List test packages used by your subworkflow

Checklist before requesting a review

• Create the tool:
  • Edit ./subworkflows/nf-neuro/<category>/<tool>/main.nf
  • Edit ./subworkflows/nf-neuro/<category>/<tool>/meta.yml
• Generate the tests:
  • Edit ./subworkflows/nf-neuro/<category>/<tool>/tests/main.nf.test
  • Run the tests to generate the main.nf.test.snap snapshots
• Ensure the syntax is correct :
  • Run prettier and editorconfig-checker to fix common syntax issues
  • Run nf-core subworkflows lint and fix all errors
  • Ensure your variables have good, clear names

[gagnonanthony]

Thanks for making this module! I only have small comments 😄

[arnaudbore]

LGTM