fix: fix Z series values in events() output, and add individual axis indices

[tlambert03]

Fixes the values for Z Series in events() and also adds T index, C Index, Z Index, etc...

[codspeed-hq]

CodSpeed Performance Report

Merging #167 will degrade performances by 14.18%

_{Comparing fix--fix-events-z-index (5666064) with main (a70c051)}

Summary

❌ 1 (👁 1) regressions
✅ 12 untouched benchmarks

Benchmarks breakdown

	Benchmark	main	fix--fix-events-z-index	Change
👁	test_time_all_metadata[jonas_control002]	34.1 ms	39.7 ms	-14.18%

[codecov]

Codecov Report

Merging #167 (5666064) into main (a70c051) will increase coverage by 0.05%.
The diff coverage is 96.77%.

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   95.04%   95.10%   +0.05%     
==========================================
  Files          17       17              
  Lines        2322     2327       +5     
==========================================
+ Hits         2207     2213       +6     
+ Misses        115      114       -1     

Files Changed	Coverage Δ
src/nd2/_ome.py	97.61% <ø> (-0.11%)	⬇️
src/nd2/readers/_modern/modern_reader.py	93.28% <95.00%> (+0.43%)	⬆️
src/nd2/_parse/_parse.py	93.81% <100.00%> (+0.04%)	⬆️
src/nd2/_util.py	97.26% <100.00%> (+0.03%)	⬆️

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