[Feature] Config Output To Project Command

[antonio-amjr]

Fix: project-chip/certification-tool#983

Description

Simple addition of config output for CLI project command using the argument --config.

The pain point tackled here is when someone would like to create or update a project using another existing project configuration from the list. With this output, one can simply copy and paste to a file to use in project manipulation.

This feature requires a specific project to print the configuration, resulting in error otherwise (I fail to see value printing all the configurations for all existing projects without knowing each is each).
Please note that the --json argument will print more information than the project config, so using the new one would be more straight forward.

Testing

Direct command test and simple sanity of the Project command.

Screenshots

[gemini-code-assist]

Code Review

This pull request introduces a new --config option to the list_projects command, enabling users to output project configurations in JSON format. The feedback focuses on improving consistency and robustness: adding a short flag -c to the new option, refactoring the __print_config utility to avoid shadowing the built-in object type, and enhancing error handling by raising a CLIError instead of using click.echo when multiple projects are provided.