Spending pool selection

[nuttycom]

Builds on #1243

[codecov]

Codecov Report

Attention: Patch coverage is 68.91892% with 46 lines in your changes are missing coverage. Please review.

Project coverage is 64.84%. Comparing base (58f46e4) to head (547e00e).

Files	Patch %	Lines
zcash_client_sqlite/src/wallet.rs	55.17%	26 Missing ⚠️
zcash_client_backend/src/data_api.rs	62.16%	14 Missing ⚠️
zcash_client_backend/src/data_api/error.rs	0.00%	3 Missing ⚠️
zcash_client_sqlite/src/lib.rs	70.00%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1244      +/-   ##
==========================================
- Coverage   64.91%   64.84%   -0.08%     
==========================================
  Files         117      117              
  Lines       12818    12922     +104     
==========================================
+ Hits         8321     8379      +58     
- Misses       4497     4543      +46     

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