[Examples] Add LFSR

[leonardt]

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.09%. Comparing base (6f48d04) to head (e27a89e).

❗ Current head e27a89e differs from pull request most recent head 92fa30b. Consider uploading reports for the commit 92fa30b to get more accurate results

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Additional details and impacted files

@@              Coverage Diff              @@
##           circt-1.66.0    #1361   +/-   ##
=============================================
  Coverage         85.09%   85.09%           
=============================================
  Files               169      169           
  Lines             17627    17627           
=============================================
  Hits              15000    15000           
  Misses             2627     2627           

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