facet-rs / facet / 19870405453

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Fix optional child fields with default not being initialized

When a struct has an optional child node field using Option<T> with both
#[facet(kdl::child)] and #[facet(default)], parsing would fail with
'Field was not initialized' if the child node was absent from the KDL input.

The fix adds code in deserialize_document_with_fields to set defaults for
missing optional child fields after processing all nodes in the document.
Also added the same fix for the solver-based deserialization path.

Added regression test: test_optional_child_with_default

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