Suggest, Infer, Verify lifetime annotations (workstream 4)

The idea is to use the lifetime analysis to conclude which parameters escape via return and can be annotated via `[[clang::lifetimebound]]`.

```cpp
std::string_view Select(bool cond, std::string_view a, std::string_view b) {
if (cond)
return a;
else
return b;
}
```
We can implement this as a clang warning:
```cpp
std::string_view Select(bool cond, std::string_view a, std::string_view b)
^^^^^^^^^^^^^ warning: param should be marked [[clang::lifetimebound]]
^^^^^^^^^^^^^ warning: param should be marked [[clang::lifetimebound]]
```