Steve Canny 47d28612f7

feat(docx): add pluggable picture sub-partitioner (#3081) ...

**Summary**
Allow registration of a custom sub-partitioner that extracts images from
a DOCX paragraph.

**Additional Context**
- A custom image sub-partitioner must implement the
`PicturePartitionerT` interface defined in this PR. Basically have an
`.iter_elements()` classmethod that takes the paragraph and generates
zero or more `Image` elements from it.
- The custom image sub-partitioner must be registered by passing the
class to `register_picture_partitioner()`.
- The default image sub-partitioner is `_NullPicturePartitioner` that
does nothing.
- The registered picture partitioner is called once for each paragraph.

2024-05-23 18:46:30 +00:00

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