RM-23161 Implemented LL based Stack & tests

[Spriithy]

Hi,

I saw the lack of a proper stack implementation in your repository, so I made one according to your guidelines & based on your other data structure implementations.

My implementation is a Linked-list based stack with O(1) overhead for Push/Pop operations. Only downside of this technique is space efficiency. But since you can make a stack of pointers, its OK.

Hope it will help!

[aviary2-wf]

Raven

Number of Findings: 0

[dustinhiatt-wf]

@Spriithy Would you mind addressing @brianshannan-wf 's question?