feat(Client) - added option to get last response body from client object

[re8260]

Added option to store response body in class variable and get it by getLastResponseBody() function.
This is needed for example to log response data.

Same functionality exists in:

• PHP Soap: https://www.php.net/manual/en/soapclient.getlastresponse.php
• Zend Framework: https://framework.zend.com/apidoc/1.12/classes/Zend_Http_Client.html#method_getLastResponse

Usage

$client = new \Iris\Client($login, $password, ['url' => 'https://dashboard.bandwidth.com/api/']);
$account = new \Iris\Account($your_account_id, $client);
$account->availableNumbers([ "areaCode" => "818" ]);
$lastResponse = $client->getLastResponseBody();

$lastResponse =
<?xml version="1.0" encoding="UTF-8" standalone="yes"?><SearchResult><ResultCount>2</ResultCount><TelephoneNumberList><TelephoneNumber>8182132977</TelephoneNumber><TelephoneNumber>8182728306</TelephoneNumber></TelephoneNumberList></SearchResult>

[jmulford-bw]

Thanks @re8260!

[re8260]

@jhindman-bw Thanks !