Initial QSfera import

Server/vendor/github.com/bits-and-blooms/bitset/bitset_iter.go

@@ -0,0 +1,23 @@
+//go:build go1.23
+// +build go1.23
+
+package bitset
+
+import (
+	"iter"
+	"math/bits"
+)
+
+func (b *BitSet) EachSet() iter.Seq[uint] {
+	return func(yield func(uint) bool) {
+		for wordIndex, word := range b.set {
+			idx := 0
+			for trail := bits.TrailingZeros64(word); trail != 64; trail = bits.TrailingZeros64(word >> idx) {
+				if !yield(uint(wordIndex<<log2WordSize + idx + trail)) {
+					return
+				}
+				idx += trail + 1
+			}
+		}
+	}
+}