Add Data Extraction

[JSv4]

feat: Add Background Annotation Extracts and Supporting Models

• Added new models in the extracts app for background annotation extracts.

  • Extract: Represents a headless, background annotation task linked to a Corpus and Fieldset.
  • Fieldset: Defines a reusable set of fields for Extracts, linked to Columns.
  • Column: Represents a discrete data structure to extract from a document, with various properties like query, match_text, output_type, and more.
  • Row: Represents extracted data for each column and document, storing data as JSON.
  • LanguageModel: Represents a language model to be used in the extraction process.

• Defined new GraphQL types, queries, and mutations for managing the new models.

  • Added CRUD operations for Extract, Fieldset, Column, Row, and LanguageModel.
  • Included necessary permissions using Django Guardian.

• Implemented Celery tasks to process extracts and generate rows.

  • Task workflow includes creating Row instances for each column and document, performing vector search, handling agentic fetch, and extracting data using a custom function.

• Followed existing design patterns for model definitions, GraphQL schema, and permissions.

• Ensured modularity and efficiency in the workflow with Celery chains and groups for parallel execution.

This update extends the annotation capabilities of the application, allowing for automated and background extraction of structured data from documents, improving efficiency and scalability.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 90.00000% with 42 lines in your changes missing coverage. Please review.

Project coverage is 68.73%. Comparing base (3f67012) to head (ece27d2). Report is 2 commits behind head on main.

Files	Patch %	Lines
opencontractserver/llms/vector_stores.py	75.28%	22 Missing :warning:
opencontractserver/tasks/extract_tasks.py	88.57%	12 Missing :warning:
opencontractserver/tasks/query_tasks.py	89.36%	5 Missing :warning:
opencontractserver/extracts/apps.py	77.77%	2 Missing :warning:
opencontractserver/utils/etl.py	97.14%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #117 +/- ## ========================================== + Coverage 65.36% 68.73% +3.37% ========================================== Files 51 58 +7 Lines 2249 2658 +409 ========================================== + Hits 1470 1827 +357 - Misses 779 831 +52 ```

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