Add asdict to Dataclass

[benjeffery]

Fixes #2719

[benjeffery]

You need to add a changelog as this is part of the public API.

[benjeffery]

Addressed in ac7cd88

[jeromekelleher]

Can we get this one in please @benjeffery?

[codecov]

Codecov Report

Merging #2759 (31af65c) into main (a3b095f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #2759   +/-   ##
=======================================
  Coverage   89.89%   89.89%           
=======================================
  Files          30       30           
  Lines       29041    29043    +2     
  Branches     5672     5672           
=======================================
+ Hits        26105    26107    +2     
  Misses       1667     1667           
  Partials     1269     1269           

Flag	Coverage Δ
c-tests	86.40% <ø> (ø)
lwt-tests	80.13% <ø> (ø)
python-c-tests	67.04% <100.00%> (+<0.01%)	⬆️
python-tests	99.01% <100.00%> (+<0.01%)	⬆️

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Impacted Files	Coverage Δ
python/tskit/util.py	100.00% <100.00%> (ø)

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