MaxPool 8 reference implementation

[tomdol]

Details:

• The kernel_position variable represented as the Coord<T> object tracks the top-left corner of the kernel. If the kernel overlaps with the padding area, the coordinates of the top-left corner are negative.
• The kernel_offset is used to to track the currently considered/processed pixel under a kernel. The offsets is always a positive number and represents a distance from the top-left corner of the kernel. For non-dilated kernel the offsets for each kernel axis are ascending ranges [0, 1, 2, ..., kernel_size). For dilated kernels the ranges are [0, dilation, 2*dilation, 3*dilation, ...)
• Those 2 variables are helpers used to calculate the current pixel index in the flattened representation of the input tensor
• They are also used to check if a given element under a kernel position belongs to the padding area.

Tickets:

• 54659

[tomdol]

@ilyachur since there's no plugin implementation yet and there's nothing to compare against, should this PR contain single layer tests or should they be delivered with any plugin implementation (CPU first I assume)?

[ilyachur]

@ilyachur since there's no plugin implementation yet and there's nothing to compare against, should this PR contain single layer tests or should they be delivered with any plugin implementation (CPU first I assume)?

It is strange to have tests which are disabled for all components 😄 I think we can add SLT tests in the separate PR.

[lazarevevgeny]

From the math perspective changes looks good, but there are a number of simple optimizations which should be applied.