This patch introduces Doxygen-style documentation to the matrix
multiplication functions. Clear descriptions and parameter details
are provided to facilitate better understanding and ease of use.

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

- Added checks for integer overflow during shifting.
- Validated matrix dimensions to prevent mismatches.
- Ensured non-null pointers before operating on matrices.

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

Changed the accumulator data type from `int64_t` to `int32_t` to reduce
instruction cycle count. This change results in an approximate 8.18% gain
in performance for matrix multiplication operations.

Performance Results:
Compiler Settings: -O2
+------------+------+------+--------+-----------+-----------+----------+
| Test Name  | Rows | Cols | Cycles | Max Error | RMS Error | Result   |
+------------+------+------+--------+-----------+-----------+----------+
| Test 1     | 3    | 5    | 6487   | 0.00      | 0.00      | Pass     |
| Test 2     | 6    | 8    | 6106   | 0.00      | 0.00      | Pass     |
+------------+------+------+--------+-----------+-----------+----------+

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

Enhanced pointer arithmetic within loops to improve readability and
reduce overhead. This change potentially reduces minor computational
overhead, contributing to overall performance improvements of around
8.23% for Test 1 and 16.00% for Test 2.

Performance Results:
Compiler Settings: -O3

+------------+------+------+--------+-----------+-----------+----------+
| Test Name  | Rows | Cols | Cycles | Max Error | RMS Error | Result   |
+------------+------+------+--------+-----------+-----------+----------+
| Test 1     | 3    | 5    | 5953   | 0.00      | 0.00      | Pass     |
| Test 2     | 6    | 8    | 5128   | 0.00      | 0.00      | Pass     |
+------------+------+------+--------+-----------+-----------+----------+

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

Updated comments for better clarity and understanding. Made cosmetic
changes such as reformatting code and renaming variables to enhance
readability without impacting functionality. This resulted in
approximately 7.97% and 15.00% performance improvements for
Test 1 and Test 2, respectively.

Performance Results:
Compiler Settings: -O2

+------------+------+------+--------+-----------+-----------+----------+
| Test Name  | Rows | Cols | Cycles | Max Error | RMS Error | Result   |
+------------+------+------+--------+-----------+-----------+----------+
| Test 1     | 3    | 5    | 5975   | 0.00      | 0.00      | Pass     |
| Test 2     | 6    | 8    | 5192   | 0.00      | 0.00      | Pass     |
+------------+------+------+--------+-----------+-----------+----------+

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

- Enhanced data pointers for matrix elements
- Streamlined loop iteration for matrix element-wise
 multiplication
- Achieved a 0.09% performance improvement in cycle count

| Rows | Cols | Cycles | Max Error | RMS Error | Result|
+------+------+--------+-----------+-----------+-------+
| 5    | 6    | 3359   | 0.00      | 0.00      | Pass  |

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>

- Changed product variable from int64_t to int32_t
- Improved performance by reducing data size
- Achieved a 11.57% performance improvement in cycle count

| Rows | Cols | Cycles | Max Error | RMS Error | Result |
+------+------+--------+-----------+-----------+--------+
| 5    | 6    | 2972   | 0.00	   | 0.00      | Pass   |

Signed-off-by: Shriram Shastry <malladi.sastry@intel.com>