Use VTL model from SDMX IM for VTL Scripts as input of semantic_analysis and execution

[javihern98]

Overview

We would like to use a TransformationScheme object from pysdmx as the script to be used.

The TransformationScheme object will be serialized as a VTL Script by using the method 'generate_vtl_script' after it is implemented on bis-med-it/pysdmx#210.

Internal functions to implement

Add a new function at InternalAPI called check_script to check if the script is a string, which we will return, or a TransformationScheme object, which we will serialized using its method generate_vtl_script and return the output. We will not use any flag related with syntax validation as we will perform it afterwards when generating the AST.

Important

Ensure we are not generating a circular method with this method as it will generate unexpected error. Place the check_script function at a separated module if necessary and use local imports if needed.