support get document by id

[imotai]

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PR-Codex overview

This PR focuses on adding a new getDoc function to the SDK and implementing the corresponding API endpoint in the IndexerNode service.

Detailed summary

• Added getDoc function to the SDK to retrieve a document by its ID.
• Implemented the GetDoc API endpoint in the IndexerNode service.
• Updated the db_store_v2.rs file to handle the getDoc request.
• Added tests for the getDoc function in the SDK and doc_store module.

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[codecov-commenter]

Codecov Report

Merging #602 (3dd1521) into main (bb44ae3) will increase coverage by 0.53%.
The diff coverage is 83.33%.

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@@            Coverage Diff             @@
##             main     #602      +/-   ##
==========================================
+ Coverage   61.70%   62.24%   +0.53%     
==========================================
  Files           9        9              
  Lines         470      482      +12     
  Branches       69       71       +2     
==========================================
+ Hits          290      300      +10     
- Misses        180      182       +2     

Flag	Coverage Δ
rust	62.24% <83.33%> (+0.53%)	⬆️

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Files Changed	Coverage Δ
sdk/src/store/document_v2.ts	84.61% <66.66%> (-2.35%)	⬇️
sdk/src/provider/indexer_provider.ts	75.60% <100.00%> (+4.18%)	⬆️

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[imotai]

@qa-agent

[qa-agent]

Unit Test Analysis

🎯level:Important
📣explanation:The pull request introduces a new function getDoc that retrieves a document from the database by its ID. This is an important functionality that needs to be thoroughly tested to ensure its correctness.

Existing Test Cases

Summary	Category	File
Test that the new function is called successfully and returns the correct document.	positive testing	sdk/tests/client_v2.test.ts
Test that the new function throws an error when the document is not found.	negative testing	sdk/tests/client_v2.test.ts

Recommended Test Cases

Summary	Category
Test that the new function is called with invalid inputs, such as null ID or non-existent collection.	edge testing