[Feature] Add Vault Hook

**Summary**
This PR adds a Vault Hook, which adds two variables to expand uses for this API.

**Justification**
I believe the changes add more useful features and explore the realm of normal server activites (Economy)

**Use Case(s)**
 * A way to provide a Hologram in-front a shop, and graphically display how much money the player has.

*Breakdown provided line by line below.*