V2 devel: options interface improvement

[pavelpatrin]

This pull request refactors how options are handled in the service container by changing the Option type from a function to an interface with an apply method. This enables a more extensible and object-oriented approach to option management. The changes affect both the core container logic and related tests, ensuring all option usages now call the apply method.

Core API changes:

• Refactored the Option type in container.go from a function to an interface with an apply method, and updated all usages to call apply instead of invoking the function directly. [1] [2]
• Added the option struct and newOption helper function to implement the new Option interface and encapsulate option logic.

Factory and service registration:

• Updated NewFactory, NewService, and NewEntrypoint to return an Option instance using the new interface, and updated error messages for consistency. [1] [2] [3] [4] [5] [6]

Test updates:

• Refactored all test usages of options in factory_test.go and registry_test.go to call the apply method instead of invoking the function directly, ensuring compatibility with the new interface. [1] [2] [3] [4] [5] [6] [7] [8] [9]

[Copilot]

Pull Request Overview

This pull request refactors the service container's option handling from a function-based approach to an interface-based design. The Option type is changed from a function to an interface with an apply method, enabling a more extensible and object-oriented approach to option management.

Key changes:

• Refactored Option type from func(ctx context.Context, registry *registry) error to an interface with an apply method
• Added option struct and newOption helper function to implement the new interface pattern
• Updated all option usage throughout the codebase to call the apply method instead of direct function invocation

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
container.go	Core refactoring of Option type to interface, updated factory/service creation functions, and added option struct implementation
factory_test.go	Updated test calls to use new apply method instead of direct function invocation
registry_test.go	Updated test calls to use new apply method instead of direct function invocation

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