Add Structural Annotations and Vector Embeddings

[JSv4]

Added a couple major features in preparation for more advanced analytics:

1. A vector embeddings column using pgvector to store vector embeddings for annotations and documents.
2. A vector embeddings microservice to generate vector embeddings
3. A modified nlm-ingestor microservice to create PAWLs token data layers and layout
   1. The old grobid-based one I forked from AllenAI has some funky output sometimes anyway, so planning to totally deprecate that.

[codecov]

Codecov Report

Attention: Patch coverage is 54.65116% with 39 lines in your changes are missing coverage. Please review.

Project coverage is 65.36%. Comparing base (51f05f2) to head (3f67012).
Report is 1 commits behind head on main.

Files	Patch %	Lines
opencontractserver/tasks/embeddings_task.py	36.66%	19 Missing ⚠️
opencontractserver/utils/embeddings.py	32.14%	19 Missing ⚠️
opencontractserver/tasks/doc_tasks.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #116      +/-   ##
==========================================
- Coverage   66.06%   65.36%   -0.71%     
==========================================
  Files          48       51       +3     
  Lines        2178     2249      +71     
==========================================
+ Hits         1439     1470      +31     
- Misses        739      779      +40     

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[JSv4]

Will improve coverage in another PR.