Add play function

[kozzy97]

Proposed change(s)

Add a function for playing configs from python, as currently there is no way to do this from inside the package.

Useful links (Github issues, ML-Agents forum threads etc.)

N/A

Types of change(s)

• [ ] Bug fix
• [X] New feature
• [ ] Code refactor
• [ ] Breaking change
• [ ] Documentation update
• [ ] Other (please describe)

Checklist

• [X] Added tests that prove my fix is effective or that my feature works
• [x] Updated the changelog (if applicable)
• [ ] Updated the documentation (if applicable)
• [ ] Updated the migration guide (if applicable)

Other comments

Screenshots (if any)

[alhasacademy96]

Just to be clear, in the PR template, the "Added tests that prove my fix is effective or that my feature works" refers to adding the unit testing for the changes/additions made, specifically writing unittesting via the python unittest module and adding them in the tests folder.

Just wanted to clarify this :)