Step name callback

[tetron]

This adds a callback hook to runtime context to provide custom logic for naming individual instances of steps (especially including scatter steps). This does not include a cwltool extension, as such a pull request (#1477) was made in 2021 and rejected, so it only adds the hook so that others can provide the desired functionality.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.77%. Comparing base (2dce710) to head (e3094a6).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2109      +/-   ##
==========================================
+ Coverage   84.74%   84.77%   +0.03%     
==========================================
  Files          46       46              
  Lines        8364     8368       +4     
  Branches     1961     1962       +1     
==========================================
+ Hits         7088     7094       +6     
+ Misses        807      805       -2     
  Partials      469      469              

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