For memoization of constant values that do not depend on any input, this
uses the global constant memoization effect to keep that value

Use this as follows: Say you have an expensive function like this that
approximates pi:


You can memoize the result as follows


Then, repeated calls to `pi` will result in returning the pre-calculated value.

Effects analysis of this code will show that it uses

memoized_constant_effect pi f64