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feat: Implement Kraken exchange adapter and related utilities (#27)

* feat: Implement Kraken exchange adapter and related utilities

- Added KrakenAdapter class to handle WebSocket connections and order book updates from Kraken.
- Introduced kraken_utils.hpp for utility functions related to Kraken data processing.
- Created SymbolNormalizer class to manage symbol mappings between exchange-specific formats and canonical formats.
- Updated feed_handler.hpp to include SymbolNormalizer for symbol conversion.
- Enhanced OrderBook class with applyDelta method for processing incremental updates.
- Added tests for Kraken utilities and symbol normalization to ensure correctness.
- Updated main.cpp to support selecting between Binance and Kraken exchanges based on configuration.

* Update tests/test_symbol_normalizer.cpp

Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

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Co-authored-by: Andrzej Pijanowski <apijanowski@cloudferro.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>

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