Consider dropping the Microsoft.Data.SqlClient dependency

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It's here only to support the CreateAsync and ResetAsync overloads that take a connection string instead of a connection.

It's a real shame to take a dependency on Microsoft.Data.SqlClient if you only ever plan to use this on PostgreSQL or MySQL for example.

It's also less of a maintenance burden (see also #142) to not have that dependency.

Of course that would require a major release since it's a breaking change.

Finally, it would be very smooth along with #151.