Pluggable device/op_handler support in c_api_tfrt. And it starts to reuse device name (e.g. /device:CPU:0) borrowed from TensorFlow. It also allows creating different op handler for different GPU devices.
Pluggable device/op_handler support in c_api_tfrt. And it starts to reuse device name (e.g. /device:CPU:0) borrowed from TensorFlow. It also allows creating different op handler for different GPU devices.

PiperOrigin-RevId: 320713554
Change-Id: Id554249713fe7571e29e8f2f36fc0986ee44e9ec

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