Model Tester: An model testing CLI

[Abellegese]

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• Have you written new tests for your core changes, as applicable?
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Description

Model Tester: An model testing CLI

[miquelduranfrigola]

FYI, Copilot-generated summary:

This pull request includes significant updates to the ersilia/cli/commands/test.py file and changes to the pyproject.toml file to enhance the functionality and dependencies of the project. The most important changes include the addition of new command-line options for the test_cmd function and the inclusion of new dependencies in the project configuration.

Enhancements to the test_cmd function:

• ersilia/cli/commands/test.py: Added new command-line options --env, --type, --level, and --dir to the test_cmd function to provide more flexibility in specifying the environment, type, level, and directory for testing models.
• ersilia/cli/commands/test.py: Removed unused imports to clean up the code and reduce potential dependencies.

Updates to project dependencies:

• pyproject.toml: Added rich as an optional dependency to enhance the project's functionality.
• pyproject.toml: Included nox in the test extras to support additional testing capabilities.