[types] add restart-from-step support to WorkflowInstance.restart()

[vaishnav-mk]

Extends WorkflowInstance.restart() to accept an optional from parameter, allowing users to restart a workflow instance from a specific step instead of from the beginning.

await instance.restart({ from: { name: 'aggregate' } });
await instance.restart({ from: { name: 'process', count: 3 } });
await instance.restart({ from: { name: 'checkpoint', type: 'do' } });

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 66.52%. Comparing base (061f8ae) to head (378df4c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6591   +/-   ##
=======================================
  Coverage   66.52%   66.52%           
=======================================
  Files         405      405           
  Lines      115815   115815           
  Branches    19381    19381           
=======================================
+ Hits        77043    77049    +6     
+ Misses      27198    27191    -7     
- Partials    11574    11575    +1     

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