add LoadOptions for setting observability providers (TracerProvider, MeterProvider)

[lucix-aws]

[aslatter]

Is this issue tracking a replacement for something like this?

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func addMeterProvider(cfg *aws.Config, meterProvider metrics.MeterProvider) {
	mpv := reflect.ValueOf(meterProvider)
	cfg.ServiceOptions = append(cfg.ServiceOptions, func(s string, a any) {
		v := reflect.ValueOf(a)
		// we expect 'a' to be a pointer to a struct with a
		// 'MeterProvider' field of type 'metrics.MeterProvider'
		if v.Kind() != reflect.Pointer {
			return
		}
		ve := v.Elem()

		if ve.Kind() != reflect.Struct {
			return
		}

		f := ve.FieldByName("MeterProvider")
		if !f.IsValid() {
			return
		}
		if !f.CanSet() {
			return
		}
		if !mpv.Type().AssignableTo(f.Type()) {
			return
		}
		f.Set(mpv)
	})
}