fix: return float dtype in interpolate (for method="linear") for numeric dtypes #11624
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part I of addressing #11595
Not changing anything to do with
method='nearest'
in this oneFor numeric types, I'm making it return float - but for temporal types, I'm preserving the current functionality of preserving the data type. It could return a high-resolution datetime instead, but it'd be backed by integers anyway so I'm not totally sure about whether that's a good idea