feat: Add new endpoint for ingestion status

[gjreda]

fixes #113

Example response below. If an unhandled exception is raised when calling this endpoint, we'll return "status": "error" with an empty list of statuses.

❯ poetry run python main.py ingest --status | jq
{
  "status": "ok",
  "reference_statuses": [
    {
      "source_filename": "A Few Useful Things to Know about Machine Learning.pdf",
      "status": "complete"
    },
    {
      "source_filename": "2301.10140.pdf",
      "status": "pending"
    },
    {
      "source_filename": "grobid-fails.pdf",
      "status": "failure"
    }
  ]
}

[codecov]

Codecov Report

Merging #181 (4b51bbe) into main (26e7617) will increase coverage by 0.37%.
The diff coverage is 91.42%.

@@            Coverage Diff             @@
##             main     #181      +/-   ##
==========================================
+ Coverage   66.53%   66.91%   +0.37%     
==========================================
  Files          87       87              
  Lines        4429     4498      +69     
  Branches      331      331              
==========================================
+ Hits         2947     3010      +63     
- Misses       1465     1471       +6     
  Partials       17       17              

Impacted Files	Coverage Δ
python/main.py	0.00% <0.00%> (ø)
python/sidecar/cli.py	0.00% <0.00%> (ø)
python/sidecar/ingest.py	90.95% <94.00%> (+0.89%)	⬆️
python/sidecar/typing.py	96.66% <100.00%> (+1.31%)	⬆️

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[cguedes]

• Update README
• Create a new command to be able to set the correct return type (CliCommands are per command)
• Try to make status field mandatory