This commit adds the `BaseInputMixin` class to the `input_mixin.py` file. The `BaseInputMixin` provides common input field attributes and methods for input fields in the codebase. This mixin includes attributes such as `field_type`, `required`, `placeholder`, `show`, `value`, `name`, `display_name`, `advanced`, `input_types`, `dynamic`, `info`, `real_time_refresh`, `refresh_button`, `refresh_button_text`, and `title_case`. The mixin also includes a `to_dict` method for converting the input field to a dictionary representation. This addition improves the organization and reusability of the codebase.
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