Fix/random interval

[laggui]

to_probability(int_random) produces a closed interval [0, 1], which was incorrect.

For uniform, u32::MAX should not map to 1 (range should be [0, 1)).
For normal, both ends should be open (0, 1).

See linked burn PR tracel-ai/burn#3321

• Added to_unit_interval_closed_open and to_unit_interval_open instead of to_probability
  • Added unit tests with basic kernel to test the low/high value mappings

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