Implement the MaxPool operation

[mathias-nillion]

Description

Much like PyTorch, our MPC AI/ML framework nada-ai implements reusable standard AI modules. Pooling operations are one of these modules.
Average pooling is already implemented here but max pooling is not.

Use Case

Max pooling is a very common operation in AI models - particularly computer vision models.

Specific Requirements

Our work on Average pooling should already provide solid template to performing kernel-style operations.
The bit that would need to change is the actual operation that the kernel performs (average -> max) which can be found here.