Add sets for performers

[AlexSrc-2]

No description provided.

[Copilot]

Pull request overview

This PR adds support for sets (collections of related products) to the YML Generator. The implementation follows the existing pattern for categories and currencies, allowing offers to be grouped into sets via set IDs.

Key changes:

• Introduces a new Set model class with id, name, and url properties
• Adds set ID fields to offers (both singular setId and plural setsId)
• Implements set generation in the XML output with conditional rendering based on whether sets are provided

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 5 comments.

File	Description
src/Model/Set.php	New model class representing a set with id, name, and url properties
src/Model/Offer/AbstractOffer.php	Adds setId and setsId properties with getters/setters, and integrates set IDs into the XML header options
src/Generator.php	Imports Set class, updates generate() signature to accept sets parameter, and adds methods to render sets in XML output
README.md	Adds example code demonstrating how to create and use sets

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[Bukashk0zzz]

@AlexSrc-2 please fix Code Style https://github.com/Bukashk0zzz/YmlGenerator/actions/runs/20427254812/job/58697910299?pr=54

[Bukashk0zzz]

https://github.com/Bukashk0zzz/YmlGenerator/actions/runs/20427254812/job/58697910299?pr=54

[Bukashk0zzz]

@AlexSrc-2 https://github.com/Bukashk0zzz/YmlGenerator/actions/runs/20431126134/job/58701985278?pr=54
need fix

[AlexSrc-2]

@Bukashk0zzz Sorry, I was in a hurry... I corrected the code style.

[Bukashk0zzz]

Update test yml https://github.com/Bukashk0zzz/YmlGenerator/actions/runs/20431817328/job/58705879211?pr=54