Algorithm::load() not available for script wrappers (Bug #4279)

Description

while trying to fix the ml-related python samples, i found
that it's impossible to load a serialized state from python atm.

adding a respective method like:

```
CV_WRAP static Ptr<SVM> load(const String &fn) {
return Algorithm::load<SVM>(fn);
}
```

to each of the ml classes would fix it, but hopefully there might be a better way (without changing the interface)

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