[Bug]: DRIFT not configurable

[MBRSL]

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Describe the bug

Though a various parameters can be set through setting.yml, it's not working for DRIFT. For example, I wish to set lower follow ups by using:

...
drift_search:
  drift_k_followups: 1

This isn't working since DRIFTSeach doesn't read config (see below).
https://github.com/microsoft/graphrag/blob/v0.5.0/graphrag/query/factories.py#L193

DRIFTSearchContextBuilder reads from config but DRIFTSeach doesn't.

Steps to reproduce

Step 1: Init graphrag with arbitary documents
Step 2: Modify setting.yml. Add drift_k_followups like the followings

drift_search:
  drift_k_followups: 1

Step 3: Index
Step 4: Ask random questions with drift search

Expected Behavior

Expected:
In the console output, it should output 5/5 in the first phase and 1/1 in the second phase

Actual:
In the console output, it output 5/5 in the first phase and 20/20 in the second phase

GraphRAG Config Used

No response

Logs and screenshots

No response

Additional Information

• GraphRAG Version: 0.5.0
• Operating System: Mac OS 14.4.1
• Python Version: 3.11.9