(examples) simple matmul

[zouzias]

This MR integrates a simple matrix multiplication kernel from https://github.com/huawei-csl/pto-kernels/blob/main/csrc/kernel/kernel_simple_matmul.cpp

[gemini-code-assist]

Code Review

This pull request introduces a simple matrix multiplication example for the tensormap_and_ringbuffer runtime, comprising an AICore kernel, AICPU orchestration logic, and a Python test suite. Several critical issues were identified during the review: the kernel entry point is currently an empty shell that does not execute the multiplication logic, and there is an out-of-bounds access when reading the configuration array. Additionally, the orchestration code has swapped indices for batch and matrix dimensions relative to the test configuration, and there are naming inconsistencies within the test cases themselves.