hugetop: replace chrono usage with jiff

[alxndrv]

Closes#761

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 19.20%. Comparing base (ff57f04) to head (0987043).
⚠️ Report is 8 commits behind head on main.

Files with missing lines	Patch %	Lines
src/uu/hugetop/src/hugetop.rs	0.00%	2 Missing ⚠️

Additional details and impacted files

@@ Coverage Diff @@## main #774 +/- ##
=======================================
Coverage 19.20% 19.20% =======================================
Files 68 68 Lines 10156 10156 Branches 546 546 =======================================
Hits 1950 1950 Misses 8206 8206 

Flag	Coverage Δ
macos_latest	6.75% <0.00%> (ø)
ubuntu_latest	19.55% <0.00%> (ø)
windows_latest	0.02% <0.00%> (ø)

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

☔ 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.