feat(zai): add streaming support

[delabon]

Description

Adds streaming support to the Zai provider.

Example:

$response = Prism::text()
        ->using(Provider::Z, 'glm-5')
        ->withPrompt('Who are you?')
        ->asStream();

    $text = '';
    $events = [];

    foreach ($response as $event) {
        $events[] = $event;

        if ($event instanceof TextDeltaEvent) {
            $text .= $event->delta;
        }
    }

Tests:

vendor/bin/pest tests/Providers/Z/StreamTest.php

Breaking Changes

Nope

[kevariable]

Looks Good man @delabon

[delabon]

Thx @kevariable !