funcr: Handle nested empty groups properly

This ruins the whole idea of pre-rendering. We simply don't know if we have to render a group until we know the whole log record. Not having values at the time that `WithGroup` is called is not sufficient information.
go-logr · Mar 1, 2024 · 376cba9 · 376cba9
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diff --git a/funcr/funcr.go b/funcr/funcr.go
diff --git a/funcr/slogsink_test.go b/funcr/slogsink_test.go