Port `SpinBox` Component to v2

[ganimtron-10]

Is your feature request related to a problem?
We are porting existing UI components to the v2 branch to remains consistent and functional as we transition to the new architecture.

Describe the solution you'd like
Port SpinBox to the v2 branch. The implementation should follow the new architecture present in v2 branch while almost preserving the original API and user experience.

Key Requirements:

• Implementation: Port the core logic from the legacy branch into the v2.
• Dependencies: Identify and port any required sub-components or internal helper classes necessary for this UI to function correctly.
• Testing: Port and adapt all existing and create new tests associated with this component to verify features.

Additional context

• Base Branch: v2
• Reference the existing v2 UI components for the standards and architecture.
• Needs Port TextBox2D Component to v2 #1109 & UI: Adding TexturedButton2D and TextButton2D #1056

[vatsal-kakadiya]

Hi @ganimtron-10 👋

Since there is ongoing discussion around the slider components and I am waiting for clarification there, I’d like to work on this issue instead.

I noticed that SpinBox depends on TextBox2D (#1109). If that dependency is resolved or if there are specific parts that can be worked on in parallel, I’d be happy to start implementing the SpinBox port following the v2 UI architecture.

Please let me know if I can take this issue or if you would recommend waiting until #1109 is completed.