feat(di): Allow changing the visibility of the generated dependency container

[chesedo]

This is done by adding a visibility modifier on the macro invocation:

// `MyContainer` will be a `pub` struct
#[dependency_container(pub)]
impl MyContainer { }

Closes #40

[Copilot]

Pull Request Overview

This PR adds support for configuring the visibility of generated dependency container structs through the #[dependency_container] macro. By default, containers remain private, but users can now specify visibility modifiers like pub, pub(crate), pub(super), or pub(in path) as macro arguments.

• Added visibility modifier parameter to the #[dependency_container] macro
• Threaded visibility through input parsing, processing, and output generation layers
• Added comprehensive test coverage for all Rust visibility modifiers

Reviewed Changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
despatma/src/lib.rs	Added documentation section explaining container visibility feature and usage examples
despatma-dependency-container/tests/expand/visibility.rs	Added test cases covering all visibility modifiers (private, pub, pub(crate), pub(self), pub(super), pub(in path))
despatma-dependency-container/tests/expand/visibility.expanded.rs	Expected macro expansion output for visibility test cases
despatma-dependency-container/src/lib.rs	Updated macro entry point to parse visibility parameter and apply it to the container
despatma-dependency-container/src/input.rs	Added vis field to Container struct with setter method and default Inherited visibility
despatma-dependency-container/src/processing/mod.rs	Added vis field to processing Container and updated conversion logic
despatma-dependency-container/src/output.rs	Added vis field to output Container and applied it to generated struct definition

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