Add functions to test orchard/sapling receiver for ownership by an account

[AArnott]

No description provided.

[codecov-commenter]

Codecov Report

Merging #37 (891a62d) into main (dcc1d9b) will decrease coverage by 0.32%.
The diff coverage is 81.17%.

@@            Coverage Diff             @@
##             main      #37      +/-   ##
==========================================
- Coverage   95.34%   95.03%   -0.32%     
==========================================
  Files          86       90       +4     
  Lines        3720     3804      +84     
==========================================
+ Hits         3547     3615      +68     
- Misses        173      189      +16     

Flag	Coverage Δ
LinuxHost	95.03% <81.17%> (-0.32%)	⬇️
Release	95.03% <81.17%> (-0.32%)	⬇️
WindowsHost	95.03% <81.17%> (-0.32%)	⬇️
macOSHost	95.03% <81.17%> (-0.32%)	⬇️

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Impacted Files	Coverage Δ
src/Nerdbank.Zcash/DiversifierKey.cs	100.00% <ø> (ø)
src/Nerdbank.Zcash/Orchard/IncomingViewingKey.cs	0.00% <0.00%> (ø)
test/Nerdbank.Zcash.Tests/Zip32HDWalletTests.cs	100.00% <ø> (ø)
src/Nerdbank.Zcash/NativeMethods.cs	84.21% <85.00%> (+0.42%)	⬆️
src/Nerdbank.Zcash/Orchard/FullViewingKey.cs	75.67% <88.23%> (+10.67%)	⬆️
...dbank.Zcash/Sapling/DiversifiableFullViewingKey.cs	92.30% <92.85%> (+0.30%)	⬆️
...erdbank.Zcash.Tests/Orchard/FullViewingKeyTests.cs	100.00% <100.00%> (ø)
....Tests/Sapling/DiversifiableFullViewingKeyTests.cs	100.00% <100.00%> (ø)
test/Nerdbank.Zcash.Tests/TestBase.cs	100.00% <100.00%> (ø)