feat: add log functionality

[olamide203]

Description

A log Node that can evaluate the log of an expression to any base. there would be a default base (2 or 10)

log(x [, base])
// where both `x` and `base` can be any valid expression already supported

Use Case

A typical use case would be the following

let x = new Expression('2log(3, 10)')
x.evaluate() // 0.954242509439...

the base can also be an expression

let y = new Expression('log(2, 3+2)')
y.evaluate() // 0.43067655807...

Anything else?

No response

[ajax484]

Boss man, I'll love to help

[olamide203]

sure, follow the contributing guide to get started. if anything is unclear, do feel free to reach out.

[tobySolutions]

Can this issue be assigned to me??

[olamide203]

I think we should hold off on this till #19 gets added since it directly relates to this feature.