feat: Add database data generator to make fakedbs easier to populate (#5922)

* feat: Add database data generator to make fakedbs easier to populate

coderd/database/dbgen/take.go

@@ -0,0 +1,29 @@
+package dbgen
+
+// takeFirstBytes implements takeFirst for []byte.
+// []byte is not a comparable type.
+func takeFirstBytes(values ...[]byte) []byte {
+	return takeFirstF(values, func(v []byte) bool {
+		return len(v) != 0
+	})
+}
+
+// takeFirstF takes the first value that returns true
+func takeFirstF[Value any](values []Value, take func(v Value) bool) Value {
+	var empty Value
+	for _, v := range values {
+		if take(v) {
+			return v
+		}
+	}
+	// If all empty, return empty
+	return empty
+}
+
+// takeFirst will take the first non-empty value.
+func takeFirst[Value comparable](values ...Value) Value {
+	var empty Value
+	return takeFirstF(values, func(v Value) bool {
+		return v != empty
+	})
+}