Create MySqlConnector.OpenTelemetry package

[bgrainger]

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.

[bgrainger]

Npgsql issue: https://github.com/npgsql/npgsql/pull/4040