Merge branch 'jacobf/2021-05-18/petscdevice-context' into 'main'

Feature: PetscDeviceContext

See merge request petsc/petsc!3994

Added PetscDevice to manage interaction and configuration of available devices.

Added PetscDeviceContext class to manage stream interactions for CUDA and HIP device
backends. The new class is design

Added PetscDevice to manage interaction and configuration of available devices.

Added PetscDeviceContext class to manage stream interactions for CUDA and HIP device
backends. The new class is designed to facilitate a fork-join parallelization model for
asynchronous compute.

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