Add confidence to useSpeechRecognition

[Javid-Izadfar]

Clear and concise description of the problem

Speech recognition API chrome mobile seems to have a problem with isFinal and the transcript result might get duplicated as result.

Suggested solution

add confidence parameter to useSpeechRecognition and filter results (each word) based on it. people can add set confidence to 0 in order to prevent this issue.

Alternative

setting continuous: false should also fix the problem but the UX would not be the same.

Additional context

https://stackoverflow.com/a/43458449

Validations

• [X] Follow our Code of Conduct
• [X] Read the Contributing Guidelines.
• [X] Read the docs.
• [X] Check that there isn't already an issue that request the same feature to avoid creating a duplicate.

[Javid-Izadfar]

I can open a PR if you're up to this change.

[Doctor-wu]

@Javid-Izadfar Contributions are welcome, but a more proper params name should be considered :)