Move static flags into DTO for Worker Factory

[roxblnfk]

What was changed

Static worker flags have been refactored to DTOs.
Now, the DTO with flags can be passed to the service container when creating the Worker Factory.

$factory = WorkerFactory::create(
    converter: $converter,
    flags: FeatureFlags::createDefaults(),
);

FeatureFlags class has two factories: createDefaults and createLegacy (any ideas for better naming?).
The first sets the flags to meet current SDK requirements.
createLegacy sets the flags to ensure compatibility with the project codebase written for SDK versions <2.11.0.

By default we create FeatureFlags using legacy set

Why?

See #494 (comment)

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Name	Status	Preview	Comments	Updated (UTC)
php	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Sep 17, 2024 2:48pm

[roxblnfk]

Closed in favor of #510