**Summary**
Step 2 in prep for pluggable auto-partitioners, remove `regex_metadata`
field from `ElementMetadata`.
**Additional Context**
- "regex-metadata" was an experimental feature that didn't pan out.
- It's implemented by one of the post-partitioning metadata decorators,
so get rid of it as part of the cleanup before consolidating those
decorators.
### Description
Update all destination tests to match pattern:
* Don't omit any metadata to check full schema
* Move azure cognitive dest test from src to dest
* Split delta table test into seperate src and dest tests
* Fix azure cognitive search and add to dest tests being run (wasn't
being run originally)
### Description
Optionally adds in chunking to the CLI which adds a flag to trigger
chunking and exposes the parameters used by the `chunk_by_title` method.
Runs chunking before the embedding step.
Opened to replace original PR
https://github.com/Unstructured-IO/unstructured/pull/1531
### Description
This PR is two-fold:
**Embeddings:**
* Embeddings incorporated into the sharepoint source connector, which
will now call out to OpenAI and create embeddings if the flag is passed
in and the api key provided.
**Writing vector content (embeddings) to Azure cognitive search index:**
* The schema for the index expected to exist in Azure has been updated
to include the vector field type and a test script has been added to
test the new content being produced from the Sharepoint connector to
push the embedding content.
Some important notes about other changes in here:
* The embedding code had to be updated to patch the `to_dict` method on
elements to add `embeddings` to the dict output if that was added. While
the code originally added the embedding content, when `to_dict` was
called to save the content as json, this was lost.
### Description
New [Azure Cognitive
Search](https://azure.microsoft.com/en-us/products/ai-services/cognitive-search)
destination connector added. Writes each json element from the created
json files via partition and writes that content to an index.
**Bonus bug fix:** Due to a recent change where the default version of
python used in the repo was bumped to `3.10` from `3.8`, this means
running `pip-compile` now runs it against that version rather than the
lowest we support which is still `3.8`. This breaks the setup for those
lower versions because some of the versions pulled in by `pip-compile`
exist for `3.10` but not `3.8`. `pip-compile` was updates to run as a
script that checks the version of python being used first, which helps
guarantee that all dependencies meet the minimum python version
requirement.
Closes out https://github.com/Unstructured-IO/unstructured/issues/1466
