Add "intent" fields with EDAM Operation values where possible

[mr-c]

https://www.commonwl.org/v1.2/CommandLineTool.html#CommandLineTool (scroll to intent)

An identifier for the type of computational operation, of this Process. Especially useful for "class: Operation", but can also be used for CommandLineTool, Workflow, or ExpressionTool.

If provided, then this must be an IRI of a concept node that represents the type of operation, preferably defined within an ontology.

For example, in the domain of bioinformatics, one can use an IRI from the EDAM Ontology's Operation concept nodes, like Alignment, or Clustering; or a more specific Operation concept like Split read mapping.

Will be useful to the Workflomics project, amongst others.