feat: tlsping and tcpping using step-by-step (#815)

## Checklist

- [x] I have read the [contribution guidelines](https://github.com/ooni/probe-cli/blob/master/CONTRIBUTING.md)
- [x] reference issue for this pull request: https://github.com/ooni/probe/issues/2158
- [x] if you changed anything related how experiments work and you need to reflect these changes in the ooni/spec repository, please link to the related ooni/spec pull request: https://github.com/ooni/spec/pull/250

## Description

This diff refactors the codebase to reimplement tlsping and tcpping
to use the step-by-step measurements style.

See docs/design/dd-003-step-by-step.md for more information on the
step-by-step measurement style.

internal/netxlite/dnstransport.go

@@ -38,7 +38,7 @@ func (t *dnsTransportErrWrapper) RoundTrip(
 	ctx context.Context, query model.DNSQuery) (model.DNSResponse, error) {
 	resp, err := t.DNSTransport.RoundTrip(ctx, query)
 	if err != nil {
-		return nil, newErrWrapper(classifyResolverError, DNSRoundTripOperation, err)
+		return nil, NewErrWrapper(ClassifyResolverError, DNSRoundTripOperation, err)
 	}
 	return resp, nil
 }