Add the function of outputting the original audio file name on the load audio node

### Feature Idea

May I ask if it is possible to add an output function on the load audio and load image nodes, which can output the file name of the loaded original audio or image in string format and connect to other nodes, such as the save node. For example, I have 50 audio files and have generated 50 videos from them. In order to distinguish the relationship between audio and video, I directly connect the file names of the audio files to the video storage node. This way, the saved videos will be prefixed with the audio names, preventing confusion.

### Existing Solutions

_No response_

### Other

_No response_

Start by locating the load audio and load image nodes, then trace how their outputs connect to the save node. Done means each loader exposes the original file name as a string output that can be connected to other nodes, including saving generated videos with an audio-derived prefix.

Written by the indexing model from the issue text.