Improve `cpp/wrong-type-format-argument` by adding correct formatting specifier

**Description of the issue**
Currently the `cpp/wrong-type-format-argument` diagnostic displays something like this

```
This argument should be of type 'int' but is of type 'unsigned long'.
```

It would be even more helpful if the diagnostic message would include the correct formatting specifier so it would look something like this:

```
This argument should be of type 'int' but is of type 'unsigned long'. Consider using '%ul' instead.
```

For reference [cppreference](https://en.cppreference.com/w/c/io/fprintf) has a great table about which specifier is needed for which type.

Start by locating the implementation of the cpp/wrong-type-format-argument diagnostic; the issue does not name a file or test. Use the cppreference fprintf table to determine the expected specifier, then ensure the diagnostic message includes it for the reported type mismatch.

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