Add transfer and purchase ordering (#150)

[VMelnalksnis]

Resolves #150

[codecov]

Codecov Report

Merging #529 (ba345b4) into master (804a902) will increase coverage by 0.03%.
The diff coverage is 79.31%.

@@            Coverage Diff             @@
##           master     #529      +/-   ##
==========================================
+ Coverage   67.79%   67.83%   +0.03%     
==========================================
  Files         300      301       +1     
  Lines        8940     8966      +26     
  Branches      649      651       +2     
==========================================
+ Hits         6061     6082      +21     
- Misses       2641     2644       +3     
- Partials      238      240       +2     

Impacted Files	Coverage Δ
....WebApi/V1/Importing/Paperless/PaperlessService.cs	0.00% <0.00%> (ø)
...ansactions/Transfers/TransferUpsertionViewModel.cs	69.87% <50.00%> (-1.01%)	⬇️
...ta.PostgreSQL/Dapper/UnsignedIntegerTypeHandler.cs	50.00% <50.00%> (ø)
...ansactions/Purchases/PurchaseUpsertionViewModel.cs	75.82% <100.00%> (+1.11%)	⬆️
...a.Core/Transactions/Purchases/PurchaseViewModel.cs	68.35% <100.00%> (+0.40%)	⬆️
...a.Core/Transactions/Transfers/TransferViewModel.cs	83.33% <100.00%> (+0.31%)	⬆️
...ade.Data.PostgreSQL/ServiceCollectionExtensions.cs	100.00% <100.00%> (ø)
source/Gnomeshade.Data/Entities/PurchaseEntity.cs	100.00% <100.00%> (ø)
source/Gnomeshade.Data/Entities/TransferEntity.cs	100.00% <100.00%> (ø)
.../Gnomeshade.WebApi.Models/Transactions/Purchase.cs	100.00% <100.00%> (ø)
... and 5 more

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