rust: id_pool: document panics in `find_unused_id` and `release_id`

`find_unused_id()` calls `Bitmap::next_zero_bit()` and `release_id()`
calls `Bitmap::clear_bit()`, both of which panic when
`CONFIG_RUST_BITMAP_HARDENED` is enabled and the index is out of
bounds. Neither `IdPool` method documents this.

Add the missing `# Panics` sections and state the bounds requirement
on `offset` and `id`.

Fixes: 2cdae413cd3e ("rust: add dynamic ID pool abstraction for bitmap")
Reviewed-by: Alexandre Courbot <acourbot@nvidia.com>
Signed-off-by: Georgios Androutsopoulos <georgeandrout13@gmail.com>
Signed-off-by: Yury Norov <ynorov@nvidia.com>

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