Subclassing an Existing DbContext for an Alternate Provider Causes Compilation Errors

In Entity Framework Core 3.1, when subclassing an existing DbContext, it will generate an error if you're missing a constructor:

`public MySqliteContext(DbContextOptions<MySqliteContext> options) : base(options)`

However, this will type error, because the constructor of the base class is expecting type DbContextOptions<MyContext> for options, not DbContextOptions<MySqliteContext>.

This is discussed an in this issue, and the work around is to add a protected constructor in the base class.
https://github.com/dotnet/efcore/issues/7533#issuecomment-353669263

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* ID: 7b011c7a-3534-78e3-b491-addd96fb5ba1
* Version Independent ID: 371826c5-3ef2-4eef-32e9-d55c777cd9d3
* Content: [Migrations with Multiple Providers - EF Core](https://docs.microsoft.com/en-us/ef/core/managing-schemas/migrations/providers?tabs=dotnet-core-cli#feedback)
* Content Source: [entity-framework/core/managing-schemas/migrations/providers.md](https://github.com/dotnet/EntityFramework.Docs/blob/master/entity-framework/core/managing-schemas/migrations/providers.md)
* Product: **entity-framework**
* Technology: **entity-framework-core**
* GitHub Login: @bricelam
* Microsoft Alias: **bricelam**