Clang tidy: add a modernize check to use the explicit object parameter

Before:

```cpp
struct S
{
auto foo() const -> void {}
};
```

After:

```cpp
struct S
{
auto foo(this S const &self) -> void {}
};
```

No file or test path is specified. Locate existing Clang-Tidy modernize checks and their corresponding tests, then compare the issue's before/after C++ examples; done means the requested explicit-object-parameter modernization is implemented with coverage for the shown form.

Written by the indexing model from the issue text.