Add unary functions to create arithmetic callbacks

[amikheychik]

The Number package defines sum(), difference(), product(), quotient(), and remainder() functions. But these functions are all binary and are not useful in the Maybe, Result, or Promise chaining.

Add unary signatures for these functions (and corresponding reverse functions, if needed):

• sum(augend: number): Unary<number, number>
• increment(addend: number = 1): Unary<number, number> (consider the difference with sum(number).
• difference(minuend: number): Unary<number, number>
• decrement(subtrahend: number = 1): Unary<number, number>
• product(multiplier: number): Unary<number, number>
• quotient(dividend: number): Unary<number, number>
• quotient2(divisor: number): Unary<number, number> (consider a better name)
• remainder(dividend: number): Unary<number, number>
• remainder(divisor: number): Unary<number, number> (consider a better name)
• powerOf(exponent: number): Unary<number, number> (see Add Math function wrappers to avoid NaN #20)

Additional new functions:

• decrement(minuend: number, subtrahend: number = 1): number
• increment(augend: number, addend: number = 1): number