Update on "[ET-VK] Using a single GPU buffer for all tensor uniforms."

This diff changes Tensor class to store all uniforms in a single uniform buffer.

Entities stored in uniforms ie. size, stride, numel and logical limits are now stored in a single buffer and their offsets are stored as unsigned ints in Tensor class.

Other changes includes:
Adding a new ctor for ParamsBuffer class to allow allocation with size without data ptr.

Adding an offset input to Buffer::data function.

Adding an offset parameter to BufferBindInfo ctor, so additional offset can be supplied when binding a buffer.

Differential Revision: [D65841750](https://our.internmc.facebook.com/intern/diff/D65841750/)

[ghstack-poisoned]

Author: trivedivivek