cleanup(jafar): do not depend on netx and urlgetter (#792)

There's no point in doing that. Also, once this change is merged, it becomes easier to cleanup/simplify netx.

See https://github.com/ooni/probe/issues/2121

internal/netxlite/resolvercore.go

@@ -9,6 +9,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"net/http"
 	"strings"
 	"time"
 
@@ -30,6 +31,15 @@ func NewResolverStdlib(logger model.DebugLogger, wrappers ...model.DNSTransportW
 	return WrapResolver(logger, newResolverSystem(wrappers...))
 }
 
+// NewParallelDNSOverHTTPSResolver creates a new DNS over HTTPS resolver
+// that uses the standard library for all operations. This function constructs
+// all the building blocks and calls WrapResolver on the returned resolver.
+func NewParallelDNSOverHTTPSResolver(logger model.DebugLogger, URL string) model.Resolver {
+	client := &http.Client{Transport: NewHTTPTransportStdlib(logger)}
+	txp := WrapDNSTransport(NewUnwrappedDNSOverHTTPSTransport(client, URL))
+	return WrapResolver(logger, NewUnwrappedParallelResolver(txp))
+}
+
 func newResolverSystem(wrappers ...model.DNSTransportWrapper) *resolverSystem {
 	return &resolverSystem{
 		t: WrapDNSTransport(&dnsOverGetaddrinfoTransport{}, wrappers...),