[nnc] Added Broadcasting (#2417)

[nnc] Added Broadcasting (#2417)

- Added Broadcasting to interpreter and shapeInference.
- Fixed interpreter impl and placed const in correct location
- Added broadcasting to softBackend
- Added tests and cpp backend implementations for broadcasted `+, -, *, /, max`
- Added generic implementation of Elementwise Broadcast for ease of
- fixed codestyle; removed shape inference file

Signed-off-by: Andrei Shedko <a.shedko@samsung.com>