Add lambda expression and `map()` function with ARM syntax

[Gijsreyn]

PR Summary

This PR implements lambda expressions and the map() function for DSC configuration documents, enabling array transformations. The implementation uses ARM compatible syntax e.g., (lambda('param', body) and lambdaVariables('param'))

Example usage:

# Transform array elements
map(createArray(1, 2, 3), lambda('x', mul(lambdaVariables('x'), 2)))
# Returns: [2, 4, 6]

Seperated tests in a different file.

PR Context

Partially addresses #57.