Use source generation for JSON serialization metadata

[VMelnalksnis]

Changes proposed in this pull request:

• Use a JsonSerializerContext in Metadata mode in WebApi and WebApi.Client

[codecov]

Codecov Report

Merging #490 (882e3b3) into master (94a13d3) will increase coverage by 0.01%.
The diff coverage is 96.01%.

@@            Coverage Diff             @@
##           master     #490      +/-   ##
==========================================
+ Coverage   66.71%   66.73%   +0.01%     
==========================================
  Files         279      279              
  Lines        8478     8480       +2     
  Branches      548      548              
==========================================
+ Hits         5656     5659       +3     
+ Misses       2641     2640       -1     
  Partials      181      181              

Impacted Files	Coverage Δ
...shade.WebApi.Client/ServiceCollectionExtensions.cs	0.00% <ø> (ø)
source/Gnomeshade.WebApi.Models/Owners/Owner.cs	0.00% <0.00%> (ø)
...ource/Gnomeshade.WebApi.Client/GnomeshadeClient.cs	78.57% <83.33%> (ø)
...onia.Core/DesignTime/DesignTimeGnomeshadeClient.cs	73.46% <100.00%> (ø)
...e.WebApi.Client/GnomeshadeJsonSerializerOptions.cs	100.00% <100.00%> (ø)
...Gnomeshade.WebApi.Client/TokenDelegatingHandler.cs	72.97% <100.00%> (ø)
...ource/Gnomeshade.WebApi.Models/Accounts/Account.cs	100.00% <100.00%> (ø)
...omeshade.WebApi.Models/Accounts/AccountCreation.cs	100.00% <100.00%> (ø)
...eshade.WebApi.Models/Accounts/AccountInCurrency.cs	100.00% <100.00%> (ø)
...ebApi.Models/Accounts/AccountInCurrencyCreation.cs	100.00% <100.00%> (ø)
... and 34 more

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