Add random_matrix utility for generating random 2D arrays

[Copilot]

Adds random_matrix(rows, cols) to pyscan.general for creating matrices with random values in [0, 1].

Changes

• New function: pyscan.general.random_matrix(rows, cols) wraps numpy.random.rand() with consistent API
• Module export: Added to pyscan.general.__init__.py
• Tests: Validates shape, value ranges, and randomness properties

Usage

import pyscan as ps

# Create 1000x2 matrix with random values between 0 and 1
matrix = ps.random_matrix(1000, 2)

Original prompt

python code for creating a 1000-by-2 matrix with random numbers between 0 and 1

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