Add initial version

[marinofelipe]

The current spmgraph version, with the addition of the recently designed edit and load functionalities that support custom spmgraph setups

[Copilot]

Pull Request Overview

This PR adds the initial version of spmgraph, a Swift Package Manager dependency graph utilities tool. The tool provides visualization, selective testing, and linting capabilities for Package.swift dependency graphs, with the addition of recently designed edit and load functionalities that support custom spmgraph setups.

Key changes:

• Core functionality for visualizing, testing, and linting SPM dependency graphs
• Command-line interface with subcommands for edit, load, tests, lint, and visualize operations
• Configuration system allowing users to create custom lint rules and settings via SPMGraphConfig.swift files

Reviewed Changes

Copilot reviewed 36 out of 38 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
Sources/SPMGraphVisualize/SPMGraphVisualize.swift	Main visualization module with GraphViz integration and PNG generation
Sources/SPMGraphTests/SPMGraphTests.swift	Selective testing functionality that maps affected modules based on git changes
Sources/SPMGraphLint/SPMGraphLint.swift	Linting engine that validates dependency graph rules and outputs formatted results
Sources/SPMGraphExecutable/	Command-line interface implementation with ArgumentParser for all subcommands
Sources/SPMGraphDescriptionInterface/	Dynamic configuration loading system for user-defined lint rules
Sources/SPMGraphConfigSetup/	Edit and load functionality for managing SPMGraphConfig.swift files
Sources/Core/	Shared utilities including system integration, package loading, and git operations
Package.swift	Swift Package Manager configuration defining all targets and dependencies

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