dvclive/utils.py does not depend on pandas

[igordertigor]

This is addressing #888

I didn't add any tests for this. Please let me know if that's needed.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.35%. Comparing base (b396fad) to head (d0b5ed2).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #890   +/-   ##
=======================================
  Coverage   95.35%   95.35%           
=======================================
  Files          55       55           
  Lines        4000     4000           
  Branches      311      311           
=======================================
  Hits         3814     3814           
  Misses        138      138           
  Partials       48       48           

Flag	Coverage Δ
dvclive	95.35% <ø> (ø)

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[skshetry]

Thanks @igordertigor.