Develop Benchmarking Component

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Week 8 (5/5) Develop benchmarking component.
(Testing Plan) Benchmark tests: Measure latency for varying matrix sizes, bit-widths, and backends.

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Currently, I use main.cpp to set up a fixed-size matrix multiplication and compare the performance between the naive implementation and the SIMD LUT version with int4.
Next, I plan to make the matrix size configurable as a parameter, so that script/benchmark.py can set the matrix dimensions through arguments. This will make it easier to compare the latency differences between the naive implementation, MKL, and int4 LUT across different matrix sizes.

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Added a fixed-size matrix multiplication for MKL in PR #23.

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Done in PR #27