Require Descriptors and DeriveKey to be Display+Clone

[dr-orlovsky]

This is generally needed in wallets downstream; without it we need to put this generic bounds nearly everywhere, which pollutes the code

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 42.5%. Comparing base (c3d2b8f) to head (efb5b67).
Report is 4 commits behind head on master.

Additional details and impacted files

@@          Coverage Diff           @@
##           master     #40   +/-   ##
======================================
  Coverage    42.5%   42.5%           
======================================
  Files          24      24           
  Lines        4232    4232           
======================================
  Hits         1800    1800           
  Misses       2432    2432           

Flag	Coverage Δ
rust	42.5% <ø> (ø)

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