[I] [C++]: Identity cast for `Time64Scalar` and `Time32Scalar` fails [arrow]

[via GitHub]

sgilmore10 opened a new issue, #45362:
URL: https://github.com/apache/arrow/issues/45362

   ### Describe the bug, including details regarding any error messages, 
version, and platform.
   
   The identity cast for `Time64Scalar` and `Time32Scalar` no longer works as 
of arrow version `16.1.0`.
   
   If this executable:
   ```c++
   #include "arrow/scalar.h"
   #include "arrow/result.h"
   #include "arrow/status.h"
   #include <iostream>
   
   arrow::Status test_scalar_cast() {
       auto type =  
arrow::time64(arrow::TimeUnit::type::MICRO);//arrow::time64(arrow::TimeUnit::type::MICRO);
       ARROW_ASSIGN_OR_RAISE(auto scalar, arrow::MakeScalar<int64_t>(type, 
int64_t(1e6)));   
       std::cout << "Casting from time64[us] scalar to time64[us] scalar..." << 
std::endl;
       ARROW_ASSIGN_OR_RAISE(auto cast_result, scalar->CastTo(type));
       return arrow::Status::OK();
   }
   
   int main(int argc, char *argv[]) { 
       auto status = test_scalar_cast();
       if (!status.ok()) {
           std::cout << "Cast failed with message: " << status.message() << 
std::endl;
       } else {
           std::cout << "Success!" << std::endl;
       }
       return 0;
   }
   ```
   is linked against arrow version `16.1.0`, the identity cast fails:
   ```bash
   $ ./main
   Casting from time64[us] scalar to time64[us] scalar...
   Cast failed with message: casting scalars of type time64[us] to type 
time64[us]
   ```
   
   However, if the executable is linked against arrow version `16.0.0`, the 
identity cast works as expected:
   ```bash
   $ ./main
   Casting from time64[us] scalar to time64[us] scalar...
   Success!
   ```
   I did some code archeology, and I believe this bug was introduced in #40237. 
   
   
   ### Component(s)
   
   C++


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