build: adding support py310

[deepcharles]

This PR adds testing and wheel building for py310.

[codecov]

Codecov Report

Merging #228 (42d4f79) into master (7c864e0) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #228   +/-   ##
=======================================
  Coverage   98.77%   98.77%           
=======================================
  Files          40       40           
  Lines         978      978           
=======================================
  Hits          966      966           
  Misses         12       12           

Flag	Coverage Δ
unittests	98.77% <ø> (ø)

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