Vedaanta Agarwalla

bumps cudnnex to 1.2.1 (PR2485)

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## What does this PR do? Bumps cudnn FE version to 1.2.1

Before submitting - [x] Was this discussed/approved via a Github issue? (no need for typos and docs improvements) - [x] Did you read the [contributor guideline](https://github.com/Lightning-AI/pytorch-lightning/blob/main/.github/CONTRIBUTING.md), Pull Request section? -...

- Modifies `README.md` to provide example apt-get cuDNN install instructions that install the cuDNN dev package. `sudo apt-get install -y cudnn` will install the default cuDNN packages, but for a...

Makes cudnn a default executor

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Before submitting - [x] Was this discussed/approved via a Github issue? (no need for typos and docs improvements) - [x] Did you read the [contributor guideline](https://github.com/Lightning-AI/pytorch-lightning/blob/main/.github/CONTRIBUTING.md), Pull Request section? -...

## 🚀 Feature Today, nvfuser requirements a manual install. It is NOT part of requirements.txt. Ideally users should be able to get all default executors without having to go through...