💡 [REQUEST] - Port TorchRL "Coding a DDPG loss" from pytorch.org/rl to pytorch.org/tutorials

[vmoens]

🚀 Descirbe the improvement or the new tutorial

For historical reasons, TorchRL privately hosts a bunch of tutorials.
We'd like to bring the most significant ones to pytorch tutorials for more visibility.

Here is the tutorial.
TorchRL splits down what is commonly referred to as Agents in other frameworks into various pieces that echo what can be found in other domains: data collection, datasets, transforms and losses. A dedicated class named LossModule covers this last functionality. We have a tutorial that instructs users on how to build and use such classes, you can help us port it to pytorch tutorials!

Steps:

1. Port the tutorial from the RL repo to the tutorials repo.
2. Fix any formatting issues or typos.
3. Make sure the tutorial follows the tutorial template (template_tutorial.py)
4. Preserve the original author

Existing tutorials on this topic

No response

Additional context

The tutorial should not require extra dependencies beyond those already present in requirements.txt

cc @nairbv

[svekars]

@nairbv Can you please assign this issue to yourself as described in #2350

[nairbv]

/assigntome