chore: move functionality from internal/rawhelpers.go to attribute (#6578)

Resolve #6524

---------

Signed-off-by: igrucci <babichevigor12@gmail.com>
Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
Co-authored-by: Tyler Yahn <codingalias@gmail.com>

attribute/rawhelpers.go

@@ -0,0 +1,37 @@
+// Copyright The OpenTelemetry Authors
+// SPDX-License-Identifier: Apache-2.0
+
+package attribute // import "go.opentelemetry.io/otel/attribute"
+
+import (
+	"math"
+)
+
+func boolToRaw(b bool) uint64 { // nolint:revive  // b is not a control flag.
+	if b {
+		return 1
+	}
+	return 0
+}
+
+func rawToBool(r uint64) bool {
+	return r != 0
+}
+
+func int64ToRaw(i int64) uint64 {
+	// Assumes original was a valid int64 (overflow not checked).
+	return uint64(i) // nolint: gosec
+}
+
+func rawToInt64(r uint64) int64 {
+	// Assumes original was a valid int64 (overflow not checked).
+	return int64(r) // nolint: gosec
+}
+
+func float64ToRaw(f float64) uint64 {
+	return math.Float64bits(f)
+}
+
+func rawToFloat64(r uint64) float64 {
+	return math.Float64frombits(r)
+}