Added import task to import a single annotated doc. Also added a test.

[JSv4]

Summary

This PR borrows code from the import_corpus task and creates a new task called import_document_to_corpus. The new task is designed to import a single document with its annotations and labels into an existing corpus. To achieve this, we introduced a new data type called OpenContractsAnnotatedDocumentImportType, which represents the JSON data structure for importing a single document along with its annotations and labels. The PDF for the document is converted to a base64 string and provided as a property in this data type.

Major changes in this PR include:

• Introduced OpenContractsAnnotatedDocumentImportType data type for importing a single document and its annotations and labels.
• Refactored import_corpus task into import_document_to_corpus task, which accepts the id of the target corpus and the new data type OpenContractsAnnotatedDocumentImportType.
• The task checks if new labels need to be created, creates them if necessary, imports the document, and finally imports the annotations for the document.
• Added a test for the import_document_to_corpus task in test_tasks.py.
• Added mutation UploadAnnotatedDocument: This mutation is responsible for uploading a single annotated document to an existing corpus. It takes two required arguments: target_corpus_id and document_import_data. The target_corpus_id is the ID of the target corpus to which the document will be added. The document_import_data is a string representation of the OpenContractsAnnotatedDocumentImportType object that contains the necessary information about the document, annotations, and labels. The mutation calls the import_document_to_corpus task with the provided arguments and applies it asynchronously.
• Added test test_upload_annotated_document: This test is designed to check whether the UploadAnnotatedDocument mutation works as expected. It sets up the necessary test environment with prerequisites such as a user, a corpus, and sample import data. The test then prepares the upload_annotated_document_mutation to be executed with the given variables (corpus ID and document import data). After executing the mutation, the test checks whether the response contains "ok" as True and the message as "SUCCESS`, indicating that the task started successfully.

[codecov]

Codecov Report

Merging #110 (c8d0d4d) into main (26cdf7a) will increase coverage by 0.82%.
The diff coverage is 81.91%.

@@            Coverage Diff             @@
##             main     #110      +/-   ##
==========================================
+ Coverage   64.68%   65.50%   +0.82%     
==========================================
  Files          48       48              
  Lines        2047     2128      +81     
==========================================
+ Hits         1324     1394      +70     
- Misses        723      734      +11     

Impacted Files	Coverage Δ
opencontractserver/tasks/export_tasks.py	26.53% <ø> (+0.26%)	⬆️
opencontractserver/utils/etl.py	20.16% <33.33%> (+0.50%)	⬆️
opencontractserver/tasks/import_tasks.py	39.24% <78.87%> (+22.58%)	⬆️
opencontractserver/tasks/__init__.py	100.00% <100.00%> (ø)
opencontractserver/tasks/doc_tasks.py	48.16% <100.00%> (+0.38%)	⬆️
opencontractserver/types/dicts.py	100.00% <100.00%> (ø)

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