Feature Request: Support for config.toml.local (gitignored local configuration overrides)

Problem Statement When working in team environments or managing multiple local Supabase projects simultaneously, developers need to customize port configurations without creating git conflicts or requiring manual config file management. Current Challenges 1. Team Collaboration: • Multiple developers need different port configurations locally (e.g., one developer uses default ports 54321-54324, another uses 55321-55324 to avoid conflicts with other projects) • config.toml is committed to git, so local port changes either: - Create unwanted git diffs that shouldn't be committed - Require developers to manually stash/revert changes before committing - Risk accidentally committing local-only configurations 2. Multiple Local Projects: • Developers often work on multiple Supabase projects that need to run simultaneously (e.g., main project + microservice + testing instance) • Each instance requires unique ports to avoid conflicts…