[w3c/gamepad] Battery level (#54)

Simple feature request: For controllers where it's applicable and that expose it, it would be nice to be able to advertise the battery charge level. Could be used for on-screen prompts (telling players that their battery is low and they may want to charge/change batteries before continuing) or in VR cases for displaying battery level on the in-world controller model, which is becoming a common practice. 

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https://github.com/w3c/gamepad/issues/54