Added intExp3 and intExp4 Functions

Why it matters

These functions were created to efficiently compute powers of 3 and 4 with integer base values. They provide a simpler, optimized way to perform exponentiation for these specific powers, reducing overhead compared to general exponentiation functions. This benefits users who need fast calculations of cube and fourth power values in their queries.

How to use it

Use the functions by calling intExp3 or intExp4 with a single integer argument. For example:

SELECT intExp3(2), intExp4(2)

This will return 8 and 16 respectively, computing 2^3 and 2^4.