[PoC] extract build logic from the Command class

[Secrus]

PoC of "actions" API, starting with the build command.

Summary by Sourcery

New Features:

• Introduce a new build function to handle the build process.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request extracts the build logic from the BuildCommand class into a static method, allowing it to be called from other commands, such as the PublishCommand.

Sequence diagram showing the new build process flow

sequenceDiagram
    participant PC as PublishCommand
    participant BC as BuildCommand
    participant Env as EnvManager
    participant Poetry

    PC->>Env: create_venv()
    Env-->>PC: env
    PC->>BC: build(poetry, env, io, output)
    BC->>Poetry: check is_package_mode
    BC->>BC: setup build environment
    BC->>BC: process build formats
    BC->>BC: build package
    BC-->>PC: return status

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Class diagram showing the refactored BuildCommand class

classDiagram
    class BuildCommand {
        +handle() int
        +static build(poetry: Poetry, env: Env, io: IO, format: str, clean: bool, local_version_label: str, output: str) int
    }
    note for BuildCommand "Build logic extracted to static method"

    class PublishCommand {
        +handle() int
    }

    PublishCommand ..> BuildCommand : uses build()

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File-Level Changes

Change	Details	Files
Extraction of build logic into a static method.	The _build method was removed. A static method build was added to encapsulate the build logic. The handle method now calls the static build method. The build method now accepts poetry, env, and io as parameters.	src/poetry/console/commands/build.py
Calling the build command from the publish command.	The publish command now calls the static build method from the BuildCommand class. The publish command now creates a virtual environment to pass to the build method.	src/poetry/console/commands/publish.py

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