Nautilus & Spears | Mounts of Mayhem backport fix

While trying the mod Nautilus & Spears | Mounts of Mayhem backport
i noticed few bugs so i made small datapack to fix some of the bugs with this mod

fixes:

• zombie nautilus and horse can now despawn if the closes player is more than 128 blocks from it (name tag prevent despawn)
• zombie nautilus and horse now burn in daylight
• nautilus will suffocate outside of water

planned :

• horse/nautilus armor protect from sunlight
• random despawninng chance when target is between 30 to 128 blocks from the player
• command to give immunity to certain mobs