Add Parallelism getter property to Accelerator class (#3703)
* Add rank property to Accelerator class
Signed-off-by: WoosungMyung <dntjd517@naver.com>
* Raise errors when parallelism configuration is not enabled
Signed-off-by: WoosungMyung <dntjd517@naver.com>
* Fix: PR feedback
Signed-off-by: WoosungMyung <dntjd517@naver.com>
* Fix: style
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Signed-off-by: WoosungMyung <dntjd517@naver.com>
Co-authored-by: S1ro1 <matej.sirovatka@gmail.com>
