Feat/radial shape pointers

[Afroz-Shaikh]

Feature

Radial Pointer as of v1.0.4 only supports Circle Pointer, this PR aims to add Rectangle, Triangle support for the Radial Gauge

• [x] Circle Pointer
• [x] Rectangle Pointer
• [x] Traingle Pointer
• [x] Diamond Pointer
• [ ] Test cases for all the pointers
• [ ] Hit Test Area for adjustment for Shape Pointers

Changes

• Added Rectangle Pointer to the Linear Gauge