[clang-tools-extra] [clang-tidy] Enhance container-data-pointer-check to suggest `c_str` for consts (PR #190590)

[Daniil Dudkin via cfe-commits]

https://github.com/unterumarmung commented:

Should this also check for implicit casts?

like
```cpp
[](std::string s) -> const char* { return &s[0]; }
```

https://github.com/llvm/llvm-project/pull/190590