Compiler inference for constants

[andyrub18]

I'd like to propose compiler inference for constants in C#. The fact is constants need to be initialized so I don't see why it is necessary to precise the type when declaring a constant.
The same way it is normal to declare a variable with var myVariable = "A variable" it should also be possible to do const myConstant = "A constant"

[HaloFour]

See: #8663