feat(ingestion-api): add ingestion rest api and indexing ingested documents

[zwpaper]

API:

DB:

Test:

1. Request to ingest:
   

2. saved in db:
   

3. updated in tantivy:

   {"chunk_attributes":{"chunk_body":"Getting Started with TabbyML/tabby\n\nThis is the main content of the document that will be ingested..."},"chunk_id":"ingested:tabby%20dev/page%20123-0","corpus":"structured_doc","id":"ingested:tabby%20dev/page%20123","source_id":"ingested:tabby%20dev","updated_at":"2025-04-24T13:40:23.487517Z"}
   {"attributes":{"kind":"ingested","link":"https://tabby.tabbyml.com/pages/123","title":"Getting Started with TabbyML/tabby"},"corpus":"structured_doc","id":"ingested:tabby%20dev/page%20123","source_id":"ingested:tabby%20dev","updated_at":"2025-04-24T13:40:23.487517Z"}

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 372 lines in your changes missing coverage. Please review.

Project coverage is 56.34%. Comparing base (6be6e15) to head (e9f91eb).
Report is 6 commits behind head on main.

Files with missing lines	Patch %	Lines
...rver/src/service/background_job/index_ingestion.rs	0.00%	102 Missing ⚠️
ee/tabby-db/src/ingestion.rs	0.00%	90 Missing ⚠️
ee/tabby-webserver/src/service/ingestion.rs	0.00%	53 Missing ⚠️
...s/tabby-index/src/structured_doc/types/ingested.rs	0.00%	43 Missing ⚠️
ee/tabby-webserver/src/routes/ingestion.rs	0.00%	19 Missing ⚠️
ee/tabby-schema/src/dao.rs	0.00%	18 Missing ⚠️
.../tabby-webserver/src/service/background_job/mod.rs	0.00%	17 Missing ⚠️
crates/tabby-common/src/api/ingestion.rs	0.00%	8 Missing ⚠️
ee/tabby-webserver/src/routes/mod.rs	0.00%	6 Missing ⚠️
ee/tabby-webserver/src/service/mod.rs	0.00%	6 Missing ⚠️
... and 3 more

❌ Your patch status has failed because the patch coverage (0.00%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4171      +/-   ##
==========================================
- Coverage   57.14%   56.34%   -0.81%     
==========================================
  Files         229      236       +7     
  Lines       28933    29349     +416     
==========================================
+ Hits        16534    16536       +2     
- Misses      12399    12813     +414     

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[wsxiaoys]

Please address the comments

[zwpaper]

@wsxiaoys I made some update since your last review, PTAL

1. drop ingestion event and index status in response as the comment
2. add ingested: prefix to source in DB and index to ensure the uniqueness of source_id
3. since the change 2, drop the manually added /ingested prefix in id and use {source}/{id} as index id