[Request]: sensors_plus stream for gravity acc request

### Plugin

sensors_plus

### Use case

I only need gravity acc values to know the phone's brief orientation. Right now, I need to get both acc and user acc values and subtract user acc from acc values to get the gravity acc value.

### Proposal

in the android and iOS documentation, I could see that they also provide gravity acc values too.
Can you make this gravity acc value accessible? like this plugin supports other acc or user acc values.