Refactor Keybindings and Set Defaults

[danpastori]

👉 Describe the problem

Allow for default keybindings to be set to control the audio player from the keyboard. It's a pain to set this everytime when 90% of the time the same button is going to perform the same task.

👥 Problem evidence & reach

Anyone wanting to control the audio player from the keyboard

🥰 Describe the "impact" on users?

You won't have to figure out basic key binding support, but maintain the ability to set any function to any key.

🏆 How to solve this problem

Step 1: Refactor the bindings config key to be key_bindings

This will be a breaking change, but makes more sense. Documentation will be provided.

Step 2: Allow for the following configurations for keybindings:

Binding from key id to Amplitude method

{
	key_bindings: [
		{
			key: 39,
			method: 'play'
		}
	]
}

Binding from key id to callback method

{
	key_bindings: [
		{
			key: 39,
			method: function(){
				// run method
			}
		}
	]
}

Binding from key id to custom method defined elsewhere

{
	key_bindings: [
		{
			key: 39,
			method: 'my_custom_method'
		}
	]
}

Default keybindings

{
	key_bindings: {
		default: true
	}
}

💯 How do we validate the problem is solved?

Developers will be able to provide complete custom control from their keyboard to their audio player defined through the key_bindings config key. They will be able to map to an Amplitude method, callback method, custom method, or set just the defaults which will be defined in the documentation.