Add support for transparent-source-only (TEX) addresses

[daira]

fixes #1167

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 46.47059% with 182 lines in your changes are missing coverage. Please review.

Project coverage is 63.06%. Comparing base (5b3ebca) to head (62298aa).

:exclamation: Current head 62298aa differs from pull request most recent head a8e279e. Consider uploading reports for the commit a8e279e to get more accurate results

Files	Patch %	Lines
...ent_backend/src/data_api/wallet/input_selection.rs	21.83%	68 Missing :warning:
zcash_client_backend/src/data_api/wallet.rs	62.90%	46 Missing :warning:
zcash_client_sqlite/src/lib.rs	40.62%	19 Missing :warning:
zcash_client_backend/src/data_api.rs	0.00%	17 Missing :warning:
zcash_client_sqlite/src/wallet/address_tracker.rs	36.36%	7 Missing :warning:
zcash_client_backend/src/fees/common.rs	50.00%	4 Missing :warning:
...ite/src/wallet/init/migrations/address_tracking.rs	60.00%	4 Missing :warning:
zcash_client_backend/src/data_api/error.rs	0.00%	3 Missing :warning:
zcash_client_backend/src/proposal.rs	70.00%	3 Missing :warning:
zcash_client_sqlite/src/error.rs	0.00%	3 Missing :warning:
... and 4 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1257      +/-   ##
==========================================
- Coverage   63.46%   63.06%   -0.40%     
==========================================
  Files         121      123       +2     
  Lines       13890    14066     +176     
==========================================
+ Hits         8815     8871      +56     
- Misses       5075     5195     +120     

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