Decouple SCM classes in Nextflow independent module

[jorgee]

This pull request refactors the Nextflow asset management to decouple the SCM functionality form the rest of the Nextflow code.

Two new packages are created

• nf-scm: Contains the SCM classes decouple from the rest of nextflow classes

• nf-utils: Contains util clases required by SCM and the rest of nextflow

alternative for #6719

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[pditommaso]

I have the feeling that #6719 is a better approach. What's the advantage of this PR ?

[jorgee]

In this PR, classes are not depending on nf-commons. only nf-utils and nf-scm are required to move to libseqera. In the other, you require to get nf-commons, nf-secrets, nf-config and nf-scm.

[pditommaso]

I understand but in my view this refactor is going too far. I think should stay in nextflow repository, other apps still benefits avoiding to import all nextflow runtime full deps tree.