Add optional Adanos sentiment mod

[alexander-schneider]

Summary

• add an optional adanos_sentiment RQAlpha mod
• expose adanos_sentiment and adanos_sentiment_compare strategy APIs
• support API keys through mod config or ADANOS_API_KEY
• document usage in the data-source extension guide and the mod README
• add mocked tests for request mapping, validation, environment API keys, base URL normalization, and API exports

Validation

• .venv/bin/python -m pytest tests/test_adanos_sentiment_mod.py -q
• .venv/bin/python -m py_compile rqalpha/mod/rqalpha_mod_adanos_sentiment/__init__.py rqalpha/mod/rqalpha_mod_adanos_sentiment/mod.py tests/test_adanos_sentiment_mod.py
• git diff --check