[Time-Series] time series patching, PatchTST
This PR added a time series patching - PatchTST
Fixes https://github.com/huggingface/transformers/issues/22075

@kashif 

Kashif impl in gluonTS: https://github.com/awslabs/gluonts/pull/2748
_The documentation is not available anymore as the PR was closed or merged._<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>comment<|||||>This issue has been automatically marked as stale because it has not had recent activity. If you think this still needs to be addressed please comment on this thread.

Please note that issues that do not follow the [contributing guidelines](https://github.com/huggingface/transformers/blob/main/CONTRIBUTING.md) are likely to be ignored.<|||||>comment<|||||>PatchTST is in Gluon, thanks to @kashif . Closing here :) https://github.com/awslabs/gluonts/pull/2748