feat(php): add iterator helper methods

[damcou]

🧭 What and Why

🎟 JIRA Ticket: APIC-599

Changes included:

⚠️
I know that this is not exactly what was done for the javascript client, but I think it was faster and more efficient to take inspiration of the current PHP client for this task since we have an already working solution (+ the way it's done for js is probably not as friendly for PHP)

• Imported existing iterators from the current PHP client: https://github.com/algolia/algoliasearch-client-php/tree/master/src/Iterators (instead of making the API calls directly in the iterators, we now pass the SearchClient in the constructor so we only use the generated methods in the client)
• Added browseObjects, browseRules and browseSynonyms in the Helper class, they call the iterators directly.
• Updated PHP search playground
• Updated migration guide related to these methods.

🧪 Test

• yarn docker cts run php
• yarn docker playground php search
• Netlify preview for the guide.

[netlify]

✅ Deploy Preview for api-clients-automation canceled.

Name	Link
🔨 Latest commit	2190fab
🔍 Latest deploy log	https://app.netlify.com/sites/api-clients-automation/deploys/630489afaea65000085e4e71

[millotp]

Looks good ! I didn't test it but if it comes from the previous client there should be no issue :)

[algolia-bot]

✗ The generated branch has been deleted.

If the PR has been merged, you can check the generated code on the main branch.
You can still access the code generated on main via this commit.

[shortcuts]

Nice!

[shortcuts]

Looks great!