feat(//cpp)!: Changes to TRTorch C++ api reflecting Input and

enabled_types

BREAKING CHANGE: This change deprecates InputRange, and the CompileSpec
fields "input_shapes", "op_precision" and associated contructors and
functions. These are replaced wtih Input, "inputs" and
"enabled_precisions" respectively. Deprecated components will be removed
in TRTorch v0.5.0

Signed-off-by: Naren Dasan <naren@narendasan.com>
Signed-off-by: Naren Dasan <narens@nvidia.com>

Author: narendasan