[FEA] Report gpuOpTime not totalTime for expand, generate, and range execs

[andygrove]

Is your feature request related to a problem? Please describe.
See #2334 for the motivation for this. This issue is to update metrics for a number of operators to report their current metric as gpuOpTime instead of totalTime, since the current metric they are using is purely the cost of applying the operation on the GPU and does not include any costs of executing or fetching data from child operators.

• GpuExpandExec
• GpuGenerateExec
• GpuRangeExec

Describe the solution you'd like
Report gpuOpTime instead of totalTime.

Describe alternatives you've considered
None

Additional context
None