Preserve names in as.IDate() and as.ITime()

[venom1204]

closes #7252

updated as.IDate and as.ITime methods to preserve names using setattr(), matching as.Date() behavior.

hi @tdhock @joshhwuu can you please have a look when you got time.
thanks

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.85%. Comparing base (0b57d38) to head (d962514).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #7800   +/-   ##
=======================================
  Coverage   98.85%   98.85%           
=======================================
  Files          87       87           
  Lines       17137    17159   +22     
=======================================
+ Hits        16941    16963   +22     
  Misses        196      196           

☔ View full report in Codecov by Harness.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[github-actions]

No obvious timing issues in HEAD=issue7252

Generated via commit d962514

Download link for the artifact containing the test results: ↓ atime-results.zip

Task	Duration
R setup and installing dependencies	6 minutes and 13 seconds
Installing different package versions	11 minutes and 33 seconds
Running and plotting the test cases	5 minutes and 21 seconds