zcash_address: Add unified::Item trait to expose opaque typed encoding

[str4d]

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[codecov]

Codecov Report

Attention: Patch coverage is 63.63636% with 4 lines in your changes missing coverage. Please review.

Project coverage is 54.16%. Comparing base (7b61fe5) to head (70689cf).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
components/zcash_address/src/kind/unified.rs	63.63%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1708      +/-   ##
==========================================
- Coverage   54.37%   54.16%   -0.21%     
==========================================
  Files         176      176              
  Lines       20385    20466      +81     
==========================================
+ Hits        11084    11086       +2     
- Misses       9301     9380      +79     

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