feat: Plugins implementation

[xepozz]

What was changed

• Added interfaces for the plugins
• Each interface has several methods that are called during the sdk working process
• Each interface has no-op trait to be able to implement only necessary methods
• There is AbstractPlugin instead of SimplePlugin as from the rest implementations
• Using plugins with the same name raise an error
• There's a convenient way to add plugins to a test class with php attribute
• Worker provides used plugins, but RoadRunner plugin doesn't support it yet

Why?

Resolves #644

Checklist

1. Closes

2. How was this tested:

3. Any docs updates needed?

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Project	Deployment	Actions	Updated (UTC)
php	Ready	Preview, Comment	Mar 6, 2026 8:24am