upgrade to .NET 6.0 and ASP.NET Core 6.0

[martinzima]

• breaking changes:
• Now targeting .NET 6.0 and .NET Standard 2.0 (dropping support for .NET Framework, .NET 3.1 and .NET Standard 2.0)
• Upgraded to ASP.NET Core 6.0, Entity Framework Core 6.0, AutoMapper 11

[codecov[bot]]

Codecov Report

Merging #51 (8400239) into develop (a3ee514) will decrease coverage by 1.79%. The diff coverage is 44.44%.

:exclamation: Current head 8400239 differs from pull request most recent head 3b27bac. Consider uploading reports for the commit 3b27bac to get more accurate results

@@             Coverage Diff             @@
##           develop      #51      +/-   ##
===========================================
- Coverage    38.35%   36.55%   -1.80%     
===========================================
  Files          481      472       -9     
  Lines         7105     6552     -553     
===========================================
- Hits          2725     2395     -330     
+ Misses        4380     4157     -223     

Impacted Files	Coverage Δ
...ns/Channels/Buffering/AggregatingBufferGovernor.cs	100.00% <ø> (ø)
.../Channels/Buffering/BufferedNotificationStartup.cs	0.00% <0.00%> (ø)
...Channels/Buffering/BufferingNotificationChannel.cs	87.50% <ø> (-5.36%)	:arrow_down:
...uffering/ProcessBufferedNotificationsJobHandler.cs	100.00% <ø> (ø)
...Core/DataAccess/Conventions/LowerCaseConvention.cs	0.00% <0.00%> (ø)
....EFCore/DataAccess/Conventions/PrefixConvention.cs	0.00% <0.00%> (ø)
...cess/Conventions/SnakeCaseColumnNamesConvention.cs	0.00% <0.00%> (ø)
...cess/Query/CustomQueryDbContextOptionsExtension.cs	0.00% <0.00%> (ø)
.../DataAccess/Query/CustomQueryProviderConfigurer.cs	0.00% <ø> (ø)
...s/EFCore/Revo.EFCore/Domain/ReadModelConvention.cs	0.00% <0.00%> (ø)
... and 273 more

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