[PHP] SOAP extension

[adamziel]

Motivation for the change, related issues

Adds support for SOAP extension to all PHP builds.

<plaintext>
<?php
//Create the client object
$soapclient = new SoapClient('https://www.w3schools.com/xml/tempconvert.asmx?WSDL');

//Use the functions of the client, the params of the function are in
//the associative array
$params = array('Celsius' => '25');
$response = $soapclient->CelsiusToFahrenheit($params);

var_dump($response);
// 77

// Get the Celsius degrees from the Farenheit
$param = array('Fahrenheit' => '77');
$response = $soapclient->FahrenheitToCelsius($param);

var_dump($response);
// 25

Supersedes #1986
Fixes #1236

Remaining work

• Rebuild all PHP binaries
• Remove the additional vitest options (stack trace length=100)

Testing Instructions (or ideally a Blueprint)

• Go to /phpinfo.php, confirm the SOAP extension is enabled
• Paste the script above as index.php in the code editor, refresh the WordPress homepage, confirm you see the expected responses

[adamziel]

The tests pass, the bundle size increases by ~350KB uncompressed, things are looking good – let's get it in!