Add speed support

**Is your feature request related to a problem? Please describe.**
Add speed support, which can help listen to audio x time faster. This is helpful for audio articles or stories.
**Describe the solution you'd like**
Add function support to speed up or down the audio playing.

**Describe alternatives you've considered**
N/A.

**Additional context**
N/A.

Start by locating the audio playback entry points and existing public functions in the native-audio project. Determine how speed-up and slow-down requests should be exposed and verify that audio articles or stories play at the requested rate across the supported native platforms.

Written by the indexing model from the issue text.