Implement reverse engineering of views for SQLite

[ErikEJ]

Part of #1679

[smitpatel]

@ErikEJ - We also need to update code to scaffold EntityType class for these DatabaseModels & appropriate code in OnModelCreating. The feature is not done till then. At present it would generate DatabaseModel but then generate warning that could not scaffold entityType for it.

[ErikEJ]

Ok, I thought this was already done.

[ErikEJ]

@smitpatel Where does the scaffolding code gen reside? Looking in vain.

[smitpatel]

@ErikEJ - RelationalScaffoldingModelFactory at present blocks the EntityTypes to be generated when there are no PK. Check RelationalScaffoldingModelFactory.VisitTable method.

After it pass-through that as keyless entityType, you would need to modify CSharpDbContextGenerator.GenerateEntityType code to skip key if not present and rather generate HasNoKey() API.

[ErikEJ]

@smitpatel Can this be merged?

[smitpatel]

@ErikEJ - Sorry, forgot to merge this earlier.

[ErikEJ]

Thanks!