Added support for REST HTTP handler.

[bshaffer]

FYI there's also a credentialsConfig option for authHttpHandler, which you could set as well (or add as a separate option). This is used in OAuth2 requests if there's an HTTP request to the OAuth2 "token" endpoint (or anywhere else, such as in external account credentials. This is set on credentialsConfig:

$clientoptions = ['credentialsConfig' => ['authHttpHandler' => $myHttpHandler]];

You could set this to the httpHandler above as well, when null, for consistency. Or you can add your own setAuthHttpHandler method for it, or do nothing at all. But I wanted to let you know it exists in case that's relevant!

[fiboknacky]

Thanks. That'd be another PR then.

[psobhanlo]

    public function search(SearchGoogleAdsRequest $request, array $callOptions = []): PagedListResponse
    {
        return $this->startApiCall('Search', $request, $callOptions);
    }

            $response = $googleAdsClient->getGoogleAdsServiceClient()->search(
                $customerId,
                $query,
                [
                    'pageSize' => $entriesPerPage,
                    'returnTotalResultsCount' => true,
                    'pageToken' => end($pageTokens)
                ]
            );