Make RichDEM a conda dependency

[dokempf]

Correctly tracks the C++ dependencies of the library

[codecov]

Codecov Report

Merging #53 (d7d8b24) into main (7538c1f) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main      #53   +/-   ##
=======================================
  Coverage   85.54%   85.54%           
=======================================
  Files          13       13           
  Lines        1086     1086           
=======================================
  Hits          929      929           
  Misses        157      157           

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