[Feature Request] Make Wire library methods virtual

I suggest making the public methods of the TwoWire class virtual in order to allow polymorphism when subclassing it.

**Use case**: Have another library that utilizes the Wire library and takes a refrence to a TwoWire instance in constructor. Want to use it on pins without hardware I2C (or other reason for not wanting to use the standard Wire implementation). So I want to pass another class instance that inherits from TwoWire and implements the same methods (but uses software I2C). This does not work with current implementation because of early binding (the base class functions will be called instead of the ones in subclass).

Moved from: https://github.com/arduino/Arduino/issues/8734

首先定位 ArduinoCore-API 中的 TwoWire 类声明，并通过引用检查其公共方法及现有用法。评估将这些方法设为 virtual 对 API 和兼容性的影响，然后验证实现相同方法的子类可以在需要 TwoWire 实例的地方传入，并接收到这些调用。

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