auto strategy was choosing the fast strategy in cases where the pdf contents were just a flat image, resulting in no output. This PR changes the behavior of auto so that elements that can be extracted by fast are extracted, a cursory examination of the elements is made to see if there are elements with text present, and if so then these elements are used as the output. Otherwise fallback strategies come into play.
* added functions for determining auto stratgy
* change default strategy to auto
* tests for auto strategy
* update docs
* changelog and version
* bump version
* remove ingest file in wrong location
* update jpg output
* typo fix
* add tests for validating strategy
* refactor into determine_pdf_strategy function
* refactor pdf strategies into strategies
* remove commented out code
* remove unreachable code
* add in handling for image types
* a little more refactoring
* import ocr partioning for images
* catch warnings, partition type for valid strategies
* fallback to ocr_only from fast
* fallback logic for hi_res
* test for fallback to ocr only
* fallback logic ofr ocr_only
* more tests for fallback logic
* update doc strings
* version and changelog
* linting, linting, linting
* update docs to include notes about strategy
* fix typos
* change back patched filename
