Performance, Air quality monitor and covers

• Optimized startup performance (Thanks to @m245seed <3)
  
• Added Air quality monitor entities for JQBJ device category (Thanks to @cruelacid <3)
  
• Added an override that prioritize entities of XT over the one from regular Tuya for these platforms:
  
  Camera
  
  Climate
  
  Cover
  
  Fan
  
  Humidifier
  
  Lock
  
  This effectively means that if an entity is handled both by Tuya and XT, on these platform the regular Tuya entity will be disabled and replaced by the XT one. (Standalone users are not affected)
  
  Enjoy!!