Extend 3-arg dot to generic HermOrSym sparse matrices

[dkarrasch]

This generalizes all-sparse 3-arg dot to non-(real or complex) eltypes, such as Quaternions.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 84.01%. Comparing base (095b685) to head (4e2da3a).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #643   +/-   ##
=======================================
  Coverage   84.01%   84.01%           
=======================================
  Files          12       12           
  Lines        9256     9258    +2     
=======================================
+ Hits         7776     7778    +2     
  Misses       1480     1480           

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[dkarrasch]

This is thoroughly tested, so I'll merge.