facet-rs / facet / 19961614563

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feat(facet-xml): add custom float formatter option for serialization

Add `FloatFormatter` type and `float_formatter()` method to `SerializeOptions`
to allow customizing how f32/f64 values are serialized to XML.

This is useful for controlling precision, trimming trailing zeros, or
implementing C-style %g formatting for cleaner output in formats like SVG.

The formatter function receives values as f64 (f32 values are upcast) and
writes to a `&mut dyn Write`, enabling zero-allocation formatting for
element content.

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