Add ufvk export

[AloeareV]

No description provided.

[codecov-commenter]

Codecov Report

Patch coverage has no change and project coverage change: -0.09 ⚠️

Comparison is base (dcdc2ec) 55.65% compared to head (2e5f074) 55.57%.

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Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #357      +/-   ##
==========================================
- Coverage   55.65%   55.57%   -0.09%     
==========================================
  Files          33       33              
  Lines        5162     5177      +15     
==========================================
+ Hits         2873     2877       +4     
- Misses       2289     2300      +11     

Impacted Files	Coverage Δ
zingolib/src/commands.rs	0.00% <0.00%> (ø)
zingolib/src/wallet/keys/unified.rs	65.00% <0.00%> (-1.52%)	⬇️

... and 5 files with indirect coverage changes

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[zancas]

superceded by #359