To add Chained Scheduler to the list of PyTorch schedulers. (#63491)

To add Chained Scheduler to the list of PyTorch schedulers. (#63491)

Summary:
In this PR we are introducing ChainedScheduler which initially proposed in the discussion https://github.com/pytorch/pytorch/pull/26423#discussion_r329976246 .

The idea is to provide a user friendly chaining method for schedulers, especially for the cases many of them are involved and we want to have a clean and easy to read interface for schedulers. This method will be even more crucial once CompositeSchedulers and Schedulers for different type of parameters are involved.

The immediate application of Chained Scheduler is expected to happen in TorchVision Library to combine WarmUpLR and  MultiStepLR https://github.com/pytorch/vision/blob/master/references/video_classification/scheduler.py#L5 . However, it can be expected that in many other use cases also this method could be applied.

### Example
The usage is as simple as below:

```python
sched=ChainedScheduler([ExponentialLR(self.opt, gamma=0.9),
                        WarmUpLR(self.opt, warmup_factor=0.2, warmup_iters=4, warmup_method="constant"),
                        StepLR(self.opt, gamma=0.1, step_size=3)])
```

Then calling
```python
sched.step()
```
would trigger step function for all three schedulers consecutively

Partially resolves https://github.com/pytorch/vision/issues/4281

Pull Request resolved: https://github.com/pytorch/pytorch/pull/63491

Reviewed By: datumbox, mruberry

Differential Revision: D30576180

Pulled By: iramazanli

fbshipit-source-id: b43f0749f55faab25079641b7d91c21a891a87e4