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Сonservative, move-only equivalent of std::function

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# any_invocable
One of possible implementations of std::any_invocable proposed in
[P0288R5](https://wg21.link/P0288R5).

This paper proposes a conservative, move-only equivalent of std::function.

### Current build
[![Linux build status](https://github.com/ofats/any_invocable/actions/workflows/linux_builds.yml/badge.svg)](https://github.com/ofats/any_invocable/actions/workflows/linux_builds.yml)
[![macOS build status](https://github.com/ofats/any_invocable/actions/workflows/macos_builds.yml/badge.svg)](https://github.com/ofats/any_invocable/actions/workflows/macos_builds.yml)
[![Windows build status](https://github.com/ofats/any_invocable/actions/workflows/windows_builds.yml/badge.svg)](https://github.com/ofats/any_invocable/actions/workflows/windows_builds.yml)

### Motivating Example
Such a code:
```c++
// requires: C++14
#include <functional>
#include <memory>

struct widget {
    // ...
};

int main() {
    std::function<void()> f = [w_ptr = std::make_unique<widget>()] { /*...*/ };
}
```
Will result in:
```
error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = widget; _Dp = std::default_delete<widget>]
```
In other words, we can't store move-only callables in `std::function`.

At the same time such a code will work:
```c++
std::any_invocable<void()> f = [w_ptr = std::make_unique<widget>()] { /*...*/ };
```

any_invocable

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