Add new attributes field to ToolStep

[dbwiddis]

Description

Adds the new (optional) "attributes" map to the MLToolSpec in the ToolStep.

Related Issues

Fixes #1112

Check List

• New functionality includes testing.
• New functionality has been documented.
• Commits are signed per the DCO using --signoff.

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[dbwiddis]

@pyek-bot can you do a quick review here?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.30%. Comparing base (56b372c) to head (99401da).
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1113      +/-   ##
============================================
+ Coverage     77.29%   77.30%   +0.01%     
- Complexity     1093     1094       +1     
============================================
  Files           101      101              
  Lines          5302     5305       +3     
  Branches        509      510       +1     
============================================
+ Hits           4098     4101       +3     
  Misses          954      954              
  Partials        250      250              

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