Use MySqlConnector instead of System.Data.SqlClient

[twerthi]

Checklist

• I have read the Contributing Guide
• [] I have checked to ensure this does not introduce an unintended breaking changes
• I have considered appropriate testing for my change

Description

This PR may introduce breaking changes in that in order to use the MySqlConnector NuGet reference, I had to remove the .NET Framework 1.3 profile. In addition, the if code block

#if MY_SQL_DATA_6_9_5
                var code = exception.ErrorCode;
#else
                var code = exception.Code;
#endif

needed to be removed as the exception object in MySqlConnector did not have a .Code property.

[twerthi]

Addresses #8

Tested against MariaDB 10.6.13 (where the old version still worked) and the latest version where it was failing.

[droyad]

I've removed the old frameworks from the release/6.0.0 branch, so if you could merge that in to yours we should be good to go.

[twerthi]

A little of a round about way of doing it, but I think we've gotten the PR where you want it.