Added more functions for Input polling

[CybernetHacker14]

Describe the issue

Added four functions to the existing Input class - IsKeyDown(), IsKeyUp(), IsMouseButtonDown(), IsMouseButtonUp(). These functions return the value only once, even when called in OnUpdate() functions. This feature has been developed to emulate Unity's GetKeyDown(), GetKeyUp(), GetMouseButtonDown(), GetMouseButtonUp() respectively.

PR impact

List of related issues/PRs this will solve:

Impact	Issue/PR
Issues this solves	None
Other PRs this solves	None

Additional context

Logic Reference :- Input.java