feat: big update to events parsing. add .events method, deprecate recorded_date

[tlambert03]

This PR adds proper support for parsing events that occur during the course of an experiment.

[codecov]

Codecov Report

Merging #144 (c58d0bd) into main (74faef9) will increase coverage by 0.16%.
The diff coverage is 92.78%.

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   92.64%   92.80%   +0.16%     
==========================================
  Files          14       14              
  Lines        1890     2058     +168     
==========================================
+ Hits         1751     1910     +159     
- Misses        139      148       +9     

Impacted Files	Coverage Δ
src/nd2/_legacy/_legacy.py	88.63% <20.00%> (-1.28%)	⬇️
src/nd2/_clx_xml.py	89.36% <50.00%> (-3.83%)	⬇️
src/nd2/_pysdk/_parse.py	92.92% <77.77%> (-1.66%)	⬇️
src/nd2/_pysdk/_pysdk.py	91.30% <96.96%> (+1.59%)	⬆️
src/nd2/_pysdk/_sdk_types.py	100.00% <100.00%> (ø)
src/nd2/_util.py	90.62% <100.00%> (+3.66%)	⬆️
src/nd2/nd2file.py	95.42% <100.00%> (+0.28%)	⬆️
src/nd2/structures.py	96.24% <100.00%> (+0.18%)	⬆️

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