Christine Straub dd144456de

Feat: return base64 encoded images for PDF's (#2310) ...

Closes #2302.
### Summary
- add functionality to get a Base64 encoded string from a PIL image
- store base64 encoded image data in two metadata fields: `image_base64`
and `image_mime_type`
- update the "image element filter" logic to keep all image elements in
the output if a user specifies image extraction
### Testing
```
from unstructured.partition.pdf import partition_pdf

elements = partition_pdf(
    filename="example-docs/embedded-images-tables.pdf",
    strategy="hi_res",
    extract_element_types=["Image", "Table"],
    extract_to_payload=True,
)
```
or
```
from unstructured.partition.auto import partition

elements = partition(
    filename="example-docs/embedded-images-tables.pdf",
    strategy="hi_res",
    pdf_extract_element_types=["Image", "Table"],
    pdf_extract_to_payload=True,
)
```

2023-12-27 05:39:01 +00:00

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