qued d8241cbcfc
fix: filename missing from image metadata (#1863)
Closes
[#1859](https://github.com/Unstructured-IO/unstructured/issues/1859).

* **Fixes elements partitioned from an image file missing certain
metadata** Metadata for image files, like file type, was being handled
differently from other file types. This caused a bug where other
metadata, like the file name, was being missed. This change brought
metadata handling for image files to be more in line with the handling
for other file types so that file name and other metadata fields are
being captured.

Additionally:
* Added test to verify filename is being captured in metadata
* Cleaned up `CHANGELOG.md` formatting

#### Testing:
The following produces output `None` on `main`, but outputs the filename
`layout-parser-paper-fast.jpg` on this branch:
```python
from unstructured.partition.auto import partition
elements = partition("example-docs/layout-parser-paper-fast.jpg")
print(elements[0].metadata.filename)

```
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