refactor: merge dnsx and errorsx into netxlite (#517)

When preparing a tutorial for netxlite, I figured it is easier
to tell people "hey, this is the package you should use for all
low-level networking stuff" rather than introducing people to
a set of packages working together where some piece of functionality
is here and some other piece is there.

Part of https://github.com/ooni/probe/issues/1591

internal/engine/httpx/fake_test.go

@@ -4,7 +4,7 @@ import (
 	"net/http"
 	"time"
 
-	"github.com/ooni/probe-cli/v3/internal/netxlite/iox"
+	"github.com/ooni/probe-cli/v3/internal/netxlite"
 )
 
 type FakeTransport struct {
@@ -19,7 +19,7 @@ func (txp FakeTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 		return txp.Func(req)
 	}
 	if req.Body != nil {
-		iox.ReadAllContext(req.Context(), req.Body)
+		netxlite.ReadAllContext(req.Context(), req.Body)
 		req.Body.Close()
 	}
 	if txp.Err != nil {

internal/engine/httpx/jsonapi.go

@@ -10,7 +10,7 @@ import (
 	"net/http"
 	"net/url"
 
-	"github.com/ooni/probe-cli/v3/internal/netxlite/iox"
+	"github.com/ooni/probe-cli/v3/internal/netxlite"
 )
 
 // Logger is the definition of Logger used by this package.
@@ -101,7 +101,7 @@ func (c Client) Do(request *http.Request) ([]byte, error) {
 	if response.StatusCode >= 400 {
 		return nil, fmt.Errorf("httpx: request failed: %s", response.Status)
 	}
-	return iox.ReadAllContext(request.Context(), response.Body)
+	return netxlite.ReadAllContext(request.Context(), response.Body)
 }
 
 // DoJSON performs the provided request and unmarshals the JSON response body