[SPARK-39840][SQL][PYTHON] Factor PythonArrowInput out as a symmetry to PythonArrowOutput

[amahussein]

Spark-context

apache/spark@2e1467f748

What changes were proposed in SPARK pull request?

Similar to the refactor done PythonArrowOutput in SPARK-29317, this PR factors the Arrow input code path out as PythonArrowInput

Why are the changes needed in Spark?

Code-refactor

Does this PR introduce any user-facing change?

No

Why it might affect RAPIDS?

Currently, We define a trait GpuPythonArrowOutput which is used
in declaring class GpuArrowPythonRunner

We will need to change GpuArrowPythonRunner to be aware of the two traits

class GpuArrowPythonRunner(

) with GpuPythonArrowInput GpuPythonArrowOutput { }

Impact on Testing?

No

Requires Doc update?

No