feat: add InputTypesMap and _instantiate_input function (#2955)

* refactor: add _input_type attribute to dump in BaseInputMixin

* feat: add InputTypesMap and _instantiate_input function

The commit adds the `InputTypesMap` dictionary and `_instantiate_input` function to the `inputs.py` file. The `InputTypesMap` is a dictionary that maps input types to their corresponding classes, and the `_instantiate_input` function is used to instantiate an input object based on its type. This change improves the flexibility and extensibility of the codebase.