Support TextMetrics  API

https://developer.mozilla.org/en-US/docs/Web/API/TextMetrics

- [ ]  actualBoundingBoxAscent
- [ ]  actualBoundingBoxDescent
- [ ]  actualBoundingBoxLeft
- [ ]  actualBoundingBoxRight
- [ ]  alphabeticBaseline
- [ ]  emHeightAscent
- [ ]  emHeightDescent
- [ ]  fontBoundingBoxAscent
- [ ]  fontBoundingBoxDescent
- [ ]  hangingBaseline
- [ ]  ideographicBaseline
- [ ]  width