[feature] _range: check that a value is within the given bounds

[mathieucaroff]

I proposal to add _range, a Lidy checker to check that a number is within the given bounds.

Syntax (lidy): _range: (min <= int/float <= max)

Example:

intExample:
  _range: (0 <= int < 100)

floatExample:
  _range: (0 <= float < 1)

positiveIntExample:
  _range: (0 <= int)

negativeIntExample:
  _range: (float <= 0)