Feat/support binance (#22)

* add docs

* Add Binance exchange support

- Updated the environment configuration to include Binance as a selectable exchange option.
- Enhanced the README documentation to reflect the addition of Binance.
- Implemented the Binance exchange adapter and integrated it into the existing exchange framework.
- Modified the basis arbitrage strategy to support Binance alongside existing exchanges.
- Added tests to ensure proper functionality and integration of Binance within the trading system.

* Enhance README with detailed Binance exchange configuration

- Added comprehensive instructions for setting up Binance as an exchange option.
- Included environment variable specifications for API keys, market types, and trading symbols.
- Provided examples for both perpetual and spot trading strategies.
- Clarified the use of WebSocket and REST for the Binance adapter.

* Enhance exchange support and testing framework

- Added a new test suite for exchange contracts to ensure consistency and functionality across supported exchanges.
- Refactored exchange ID handling to utilize a centralized list of supported exchanges, improving maintainability.
- Updated CLI argument parsing and help documentation to reflect the new exchange structure.
- Introduced utility functions for validating supported exchanges and their display names.
- Enhanced the BasisApp and strategy runner to leverage the new exchange validation logic.
- Added a new test command for running exchange-related tests.

* Refactor exchange contract tests and update CLI commands

- Removed the trailing supported exchanges set and simplified the logic for trailing stop support in the exchange contract tests.
- Updated the test command for exchange contracts to exclude unnecessary tests, streamlining the testing process.
- Enhanced test descriptions for clarity and improved understanding of the functionality being tested.

docs/binance/binance-spot/testnet_websocket-api_data-sources.md

@@ -0,0 +1,37 @@
+---
+title: "Data sources | Binance Open Platform"
+source: "https://developers.binance.com/docs/binance-spot-api-docs/testnet/websocket-api/data-sources"
+fetched_at: "2026-02-26T10:38:11.308Z"
+---
+-   The API system is asynchronous. Some delay in the response is normal and expected.
+    
+-   Each method has a data source indicating where the data is coming from, and thus how up-to-date it is.
+    
+
+Data Source
+
+Latency
+
+Description
+
+Matching Engine
+
+lowest
+
+The Matching Engine produces the response directly
+
+Memory
+
+low
+
+Data is fetched from API server's local or external memory cache
+
+Database
+
+moderate
+
+Data is retrieved from the database
+
+-   Some methods have more than one data source (e.g., Memory => Database).
+    
+    This means that the API will look for the latest data in that order: first in the cache, then in the database.