add pkg/pointer package

some of the methods will now start taking pointer-based values, so lets
bring a utility to help passing those.

Signed-off-by: Ciro S. Costa <utxobr@protonmail.com>

pkg/pointer/pointer.go

@@ -0,0 +1,41 @@
+package pointer
+
+// Int32 returns a pointer to an int32.
+func Int32(i int32) *int32 {
+	return &i
+}
+
+// Int64 returns a pointer to an int64.
+func Int64(i int64) *int64 {
+	return &i
+}
+
+// Uint32 returns a pouinter to an uint32.
+func Uint32(i uint32) *uint32 {
+	return &i
+}
+
+// Uint64 returns a pouinter to an uint64.
+func Uint64(i uint64) *uint64 {
+	return &i
+}
+
+// Bool returns a pointer to a bool.
+func Bool(b bool) *bool {
+	return &b
+}
+
+// String returns a pointer to a string.
+func String(s string) *string {
+	return &s
+}
+
+// Float32 returns a pointer to the a float32.
+func Float32(i float32) *float32 {
+	return &i
+}
+
+// Float64 returns a pointer to the a float64.
+func Float64(i float64) *float64 {
+	return &i
+}