Correctly construct outputs when spending internal notes.

[nuttycom]

This builds atop #658

[codecov]

Codecov Report

Base: 72.57% // Head: 74.15% // Increases project coverage by +1.58% 🎉

Coverage data is based on head (5aa9f8f) compared to base (d4f4f5a).
Patch coverage: 95.34% of modified lines in pull request are covered.

❗ Current head 5aa9f8f differs from pull request most recent head 981d45e. Consider uploading reports for the commit 981d45e to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
+ Coverage   72.57%   74.15%   +1.58%     
==========================================
  Files         107      106       -1     
  Lines       10926    10306     -620     
==========================================
- Hits         7929     7642     -287     
+ Misses       2997     2664     -333     

Impacted Files	Coverage Δ
zcash_client_backend/src/address.rs	86.40% <ø> (ø)
zcash_client_backend/src/data_api/error.rs	16.00% <0.00%> (-0.33%)	⬇️
zcash_client_backend/src/encoding.rs	36.79% <ø> (ø)
zcash_client_sqlite/src/wallet/init.rs	70.90% <ø> (ø)
zcash_client_sqlite/src/wallet/transact.rs	76.74% <ø> (ø)
zcash_extensions/src/transparent/demo.rs	76.62% <ø> (ø)
zcash_primitives/src/merkle_tree.rs	93.28% <ø> (+0.42%)	⬆️
zcash_primitives/src/transaction/builder.rs	81.81% <ø> (ø)
zcash_client_backend/src/data_api/wallet.rs	53.84% <92.30%> (+0.98%)	⬆️
zcash_client_backend/src/keys.rs	88.55% <100.00%> (ø)
... and 27 more

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[str4d]

Reviewed f3f31dab1cea2a3490e02001c5461737f52095f1.

[pacu]

utACK

[str4d]

utACK cdfca84 after changelog updates.

[str4d]

Re-utACK 981d45e. Changes over last review are only to documentation.