reflection: add initial New() validating type and triggering a scan

Signed-off-by: Alejandro Mery <amery@jpi.io>

reflection/reflection.go

@@ -1,2 +1,36 @@
 // Package reflection helps Marshalling/Unmarshalling data to structs
 package reflection
+
+import (
+	"reflect"
+)
+
+// Reflection provides Marshalling/Unmarshalling oriented view
+// of a value
+type Reflection[T any] struct {
+	rv reflect.Value
+	rt reflect.Type
+}
+
+// Value returns the object it reflects
+func (r *Reflection[T]) Value() *T {
+	return r.rv.Interface().(*T)
+}
+
+// New creates a Reflection of the given pointer
+func New[T any](v *T) (*Reflection[T], error) {
+	if v == nil {
+		err := &InvalidUnmarshalError{Type: reflect.TypeOf(v)}
+		return nil, err
+	}
+
+	r := &Reflection[T]{
+		rv: reflect.ValueOf(v),
+		rt: reflect.TypeOf(v),
+	}
+
+	if err := r.scan(); err != nil {
+		return nil, err
+	}
+	return r, nil
+}