Provide DynamicAutoDiffCostFunction deduction guide

The deduction guide allows to avoid repeating the CostFunctor type.

Change-Id: I2285de37071006a97f89988baa9b7054d82dae86

internal/ceres/dynamic_autodiff_cost_function_test.cc

@@ -1,5 +1,5 @@
 // Ceres Solver - A fast non-linear least squares minimizer
-// Copyright 2022 Google Inc. All rights reserved.
+// Copyright 2023 Google Inc. All rights reserved.
 // http://ceres-solver.org/
 //
 // Redistribution and use in source and binary forms, with or without
@@ -803,4 +803,9 @@ TEST(DynamicAutoDiffCostFunction,
   EXPECT_EQ(residual, target_value);
 }
 
+TEST(DynamicAutoDiffCostFunctionTest, DeductionTemplateCompilationTest) {
+  // Ensure deduction guide to be working
+  (void)DynamicAutoDiffCostFunction(new MyCostFunctor());
+}
+
 }  // namespace ceres::internal