add abctorst and rsttoabc for Tri, Tet, and Pyr elements

[jlchan]

Tri element uses rstoab and abtors instead though

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (97e9f79) 99.83% compared to head (c2263c3) 99.84%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #15   +/-   ##
=======================================
  Coverage   99.83%   99.84%           
=======================================
  Files          12       12           
  Lines         609      625   +16     
=======================================
+ Hits          608      624   +16     
  Misses          1        1           

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