fix: xumpy.random() honors dtype now

[romanc]

Description

xumpy.random() didn't look at the dtype that could be provided. The new version of the function uses numpy/cupy the default random number generator, which has support for setting the dtype, though limited to float32/float64.

How has this been tested?

Extended existing test coverage.

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas: N/A
• I have made corresponding changes to the documentation (e.g. add new modules to docs/docstrings/): N/A
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules: N/A
• New check tests, if applicable, are included

[FlorianDeconinck]

Good catch