Create MySqlConnector.OpenTelemetry package

This could be a very simple shim that adds a `public static TracerProviderBuilder AddMySqlConnector(this TracerProviderBuilder builder)` API. 

See Npgsql implementation https://github.com/npgsql/npgsql/tree/main/src/Npgsql.OpenTelemetry and documentation https://www.npgsql.org/doc/diagnostics.html#tracing-with-opentelemetry-experimental for an example.