Add functions and parsing in select keyword

[Universemul]

Description

For the select keyword, we can define some functions to apply when we retrieve the result.
This PR add the skeleton of Function and add a parsing for each item in the select keyword

Screenshots (if appropriate):

Types of Changes

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)