More specific API for input bindings

[cocopon]

Many users want to change a slider value range or list options for input bindings. (e.g. #63 #352)

Currently there is no safe way to do this, but more specific input bindings API might be useful. For example...

class SliderInputBindingApi extends InputBindingApi {
   get min() {...}
   get max() {...}
}

Ideally, the blade with addInput() and the blade with addBlade() should have same interface. The presence or absence of the binding may not affect the API interface.

[cocopon]

InputBindingController.binding is not needed in most cases, but for example, it's used for adding presetKey to change events:

tweakpane/lib/blade/rack/api/rack.ts

Line 228 in b5b7b5e

binding.target.presetKey,