Numeric Fan speeds to support newer multispeed fan

Tags: #<Tag:0x00007f32817e0d78> #<Tag:0x00007f32817e0c38>

Hi, Can we extend the Fan Class to accommodate numeric speeds as a lot of new pedestal and ceiling fan are multispeed (up to 8) and mapping devices to Low, Medium and High isn’t really representative of these new devices, especially if we map in things like localtuya, etc.