feat: add finished piece count element in types

[fcgxz2003]

Add finished piece count element in types.

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation Update (if none of the other choices apply)

Checklist

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

Codecov Report

Merging #2557 (0aec09b) into main (94e4b7a) will increase coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main    #2557      +/-   ##
==========================================
+ Coverage   51.51%   51.53%   +0.02%     
==========================================
  Files         158      158              
  Lines       20988    20990       +2     
==========================================
+ Hits        10811    10818       +7     
+ Misses       9556     9554       -2     
+ Partials      621      618       -3     

Flag	Coverage Δ
Object-compatibility-e2etests	?
e2etests	?
unittests	51.53% <50.00%> (+0.02%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
scheduler/service/service_v1.go	80.33% <50.00%> (-0.06%)	⬇️

... and 2 files with indirect coverage changes

[gaius-qi]

LGTM