Add custom check for speech recognition

[Rei-x]

New option in addSpeechEvent function that allows custom check if speech should be processed. Example usage:

addSpeechEvent(client, {
  shouldProcessSpeech: (user) => {
    if (user.username === "awesomeNickname") {
      return true;
    }
    return false;
  }
})

Speech will be processed only when someone with "awesomeNickname" said something

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