Update on "[ET-VK][Ops] aten.tan.default from scratch implementation"

Following the instructions here for creating a new operator from scratch for learning purposes:
https://www.internalfb.com/wiki/ExecuTorch_Vulkan_Backend/Development_0/Adding_a_New_Operator_Implementation/

Goal is to create a tan operator and its test case

Differential Revision: [D75100188](https://our.internmc.facebook.com/intern/diff/D75100188/)

[ghstack-poisoned]

Author: morelos