Move `RunArray::get_physical_indices` to `RunEndBuffer`

[Jefffrey]

Original context: https://github.com/apache/arrow-rs/pull/9019/changes#r2635583677

Is your feature request related to a problem or challenge? Please describe what you are trying to do.

The RunArray::get_physical_indices method technically operates solely on the RunEndBuffer of the array:

arrow-rs/arrow-array/src/array/run_array.rs

Lines 197 to 204 in addf74d

	// TODO: this technically should be a method on RunEndBuffer
	#[inline]
	pub fn get_physical_indices<I>(&self, logical_indices: &[I]) -> Result<Vec<usize>, ArrowError>
	where
	I: ArrowNativeType,
	{
	let len = self.run_ends().len();
	let offset = self.run_ends().offset();

Describe the solution you'd like

Move this implementation to RunEndBuffer, and leave RunArray::get_physical_indices as a thin wrapper. Maybe also deprecate it?

Describe alternatives you've considered

Additional context

No sure how it affects inlining, since we do have the #[inline] attribute present 🤔

[alamb]

label_issue.py automatically added labels {'arrow'} from #9019