Function call optimization

[sergiocastelani]

This pull request refactors the DrapoFunctionHandler class to streamline how function executions are handled. Instead of a long series of conditional statements, it introduces a centralized map of function executors, allowing for easier maintenance and optimized function search. Several function signatures are also updated to ensure consistency in how parameters are passed.

Refactoring for maintainability and extensibility:

• Introduced a _functionExecutors map in DrapoFunctionHandler to associate function names with their executor methods, replacing the previous large conditional block. [1] [2] [3]
• Moved those pages that can't be tested automatically from folder DrapoPages to the new folder ManualTests.

Consistency improvements:

• Updated the signatures of ExecuteFunctionExternal, ExecuteFunctionReloadPage, and ExecuteFunctionClosePage to accept all standard parameters, including sector, contextItem, element, event, functionParsed, and executionContext, and made them asynchronous for consistency with other executors. [1] [2]