DB migrations improvements: hooks and transaction modes

[martinzima]

Added

• database migration hooks - can now listen to events like DatabaseMigrationBeforeAppliedEvent, DatabaseMigrationAppliedEvent and DatabaseMigrationsCommittedEvent
• transactionMode for database migrations (isolated, without) for overriding their transaction behavior

Changed

• database migrations are run inside a unit of work when using EF Core and EF6 providers
• EF Core/EF6 migration providers no longer create database upon startup
• renamed lifecycle hook interfaces (IApplicationStartedListener, IApplicationStoppingListener) and added new IApplicationStartingListener hook

[codecov[bot]]

Codecov Report

Merging #35 (054b92f) into develop (bae8e95) will decrease coverage by 0.10%. The diff coverage is 24.42%.

@@             Coverage Diff             @@
##           develop      #35      +/-   ##
===========================================
- Coverage    36.75%   36.64%   -0.11%     
===========================================
  Files          471      475       +4     
  Lines         6944     7011      +67     
===========================================
+ Hits          2552     2569      +17     
- Misses        4392     4442      +50     

Impacted Files	Coverage Δ
...ions.History/ChangeTracking/ChangeDataTypeCache.cs	0.00% <ø> (ø)
...Extensions.History/ChangeTracking/HistoryModule.cs	0.00% <0.00%> (ø)
.../Channels/Buffering/BufferedNotificationStartup.cs	0.00% <ø> (ø)
...vo.Extensions.Notifications/NotificationsModule.cs	0.00% <0.00%> (ø)
...ers/EF6/Revo.EF6/DataAccess/EF6DataAccessModule.cs	0.00% <0.00%> (ø)
...6/Revo.EF6/DataAccess/Entities/DbContextFactory.cs	0.00% <ø> (ø)
...aAccess/Migrations/EF6DatabaseMigrationProvider.cs	0.00% <0.00%> (ø)
...o.EF6/DataAccess/Migrations/EF6MigrationsModule.cs	0.00% <0.00%> (ø)
...6/Revo.EF6/DataAccess/Model/EntityTypeDiscovery.cs	0.00% <0.00%> (ø)
...Revo.EF6/DataAccess/Model/ModelMetadataExplorer.cs	0.00% <ø> (ø)
... and 51 more

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