Add IS_FILE_RENDERED filter to enhance file processing flexibility

[Abdul-Muqadim-Arbisoft]

Description: This pull request introduces a new filter, IS_FILE_RENDERED, designed to enhance the flexibility of file handling within Tutor plugins. The new IS_FILE_RENDERED filter allows plugin developers to specify files that should not be rendered but instead copied .

Implementation Details: The IS_FILE_RENDERED filter works by accepting a boolean flag and a file path. It returns a boolean indicating whether the file should be rendered. By default, all files are set to be rendered unless explicitly specified .

[hinakhadim]

@DawoudSheraz @regisb I have tested this and working fine. Can you plz review it?

[DawoudSheraz]

@hinakhadim This is waiting on your review, thanks.