[BUG] incorrect type hints such as `callable`

[jamesbraza]

Describe the bug

Reading the code, it's clear this code base can really benefit from type checking, running vanilla mypy reveals over 1.2k type errors.

For example, callable is not a valid type hint: https://github.com/huggingface/lighteval/blob/v0.9.2/src/lighteval/metrics/utils/metric_utils.py#L62-L63

To Reproduce

uv sync --extra dev
uv pip install mypy==0.15.0
mypy src

Expected behavior

Type hints to be correct.

Version info

lighteval==0.9.2