Support runs with no outputs and file arrays

[simleo]

Fixes several problems exposed by testing cwlprov_to_crate against this workflow run.

• Add support for:
  • disconnected step graphs
  • runs with no output
  • file array parameters (File[])
  • one-to-many parameter connections (e.g., output of s1 fed to both s2 and s3)
  • scatter jobs (multiple jobs for the same step)
• Use the same ids as in packed.cwl for formal parameters (e.g., packed.cwl#main/reverse_sort)
• Fix agent id when it's not an ORCID