[Feature] Graph image rendering of contained CWL

[fmigneault]

We could provide a visual rendering of process Application Package and workflows using these tools.

Directly with cwltool! https://github.com/common-workflow-language/cwltool/commit/cbc33f3ee9cbec5357b017e39fd317eb7ed1df5b

• [ ] rendering of SVG: https://github.com/common-workflow-language/cwltool#visualizing-a-cwl-document
• [ ] rendering of RDF: https://github.com/common-workflow-language/cwltool#modeling-a-cwl-document-as-rdf
• [ ] return rel: dot link
• [ ] return rel: rdf link
• [ ] consider png or similar rendering to reuse in process HTML view
• [ ] return rel: preview and rel: thumbnail

More info / updates / guides to run: https://www.biostars.org/p/366246/

Original sources (but somewhat not maintained): https://github.com/giannisdoukas/pycwlviewer https://github.com/common-workflow-language/cwlviewer

[fmigneault]

CWL Example: https://view.commonwl.org/workflows/github.com/genome/analysis-workflows/blob/0b6e8fd8ead7644cf5398395b76af5cf4011686f/definitions/subworkflows/sequence_align_and_tag_adapter.cwl SVG Result: https://view.commonwl.org/git/0b6e8fd8ead7644cf5398395b76af5cf4011686f/definitions/subworkflows/sequence_align_and_tag_adapter.cwl?format=svg (note: many other formats available at bottom of the page)