inline anonymous cwl tools have unstable generated IDs

For workflows with tools that are specified in-line and don't have their own IDs (e.g. see https://github.com/common-workflow-language/cwl-v1.2/blob/main/tests/timelimit2-wf.cwl), the parser gives the tools randomly generated IDs. Importantly, those IDs are not stable, i.e. if I run `--print-subgraph` to get the ID and then run `--single-process ` it doesn’t work because the ID has changed between the first and second invocation.

I can think of two possible solutions to this:

* Use the stage ID and add `/run` (or some other pre-defined suffix) to get the tool ID. So if the stage ID is `#main/step1` then the tool ID would be `#main/step1/run`.
* Hash the contents of `run` and use the value as the ID.