Account for character descenders in text-radial-offset
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@zmiao is already working on this.
Since Sep 19, 2019.
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Description
## Motivation
Like `text-offset` that accepts number or an array of two numbers that adjusts the `x` and `y` coordinates, it would be great if `text-radial-offset` allowed the same functionality. That would account for the extra distance top positioned labels need for characters with descenders (i.e `g, p, q`):

## Design Alternatives
Not provide `top` as a list of possible positions to `text-variable-anchor` but that's a little limiting.
## Design
```js
{
text-radial-offset: [0.5, 1] // x, y
}
```
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