List Object - Add LastModified

[bstopp]

Description

Add a lastModified attribute to the list object response.

Related Issue

#75

Motivation and Context

As per request.

How Has This Been Tested?

Added new tests to cover the expected response.

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)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• 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.
• All new and existing tests passed.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 52.89%. Comparing base (2696893) to head (49e8390).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #76      +/-   ##
==========================================
+ Coverage   47.52%   52.89%   +5.37%     
==========================================
  Files          38       38              
  Lines        1776     1779       +3     
==========================================
+ Hits          844      941      +97     
+ Misses        932      838      -94     

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