Replace zstd with stdlib and backports zstd

[Schamper]

Supersedes #68

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 78.01%. Comparing base (0c89766) to head (a3df7db).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #69      +/-   ##
==========================================
+ Coverage   77.66%   78.01%   +0.35%     
==========================================
  Files          26       26              
  Lines        2207     2202       -5     
==========================================
+ Hits         1714     1718       +4     
+ Misses        493      484       -9     

Flag	Coverage Δ
unittests	78.01% <100.00%> (+0.35%)	⬆️

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[yunzheng]

novermin trips on this try except block, add # novermin to ignore this.

Suggested change

	if sys.version_info >= (3, 14):
	from compression import zstd
	else:
	from backports import zstd
	if sys.version_info >= (3, 14):
	from compression import zstd # novermin
	else:
	from backports import zstd