Track bytes read even when its a FragmentResultCache hit

[NikhilCollooru]

Description

Track bytes read even when its a FragmentResultCache hit

Motivation and Context

Currently, the input bytes, positions read for a query are reported
as 0 when there is a 100% fragment result cache hit. But for some
usecases its helpful to report the input data size even when its
a fragment result cache hit.
This PR adds support to track the input data size for every fragment
we cache.

Impact

Test Plan

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Release Notes

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== RELEASE NOTES ==

General Changes
* Add support for tracking of the input data size even when there is a fragment result cache hit. This can be enabled by setting the config ```fragment-result-cache.input-data-stats-enabled=true```.

[NikhilCollooru]

The numbers are not reported correctly even after this change. There is some bug, still need to fix it.

with 0% FRC cache hit rate : 20240322_172109_00004_ay76e (input size: 2.29GB , input rows : 16,622,497)
with 100% FRC cache hit rate: 20240322_172356_00005_ay76e (from runtime stats the input dat : 145MB , from query plan the input rows :3,829,327)

[jainxrohit]

@NikhilCollooru Is there an easy way to test and reproduce this? I wanted to use this to debug.

[NikhilCollooru]

The trick is to use sourceOperator instead of activeOperators(0). After the change to use the sourceOperator, i see things are working correctly as expected.

[jainxrohit]

@NikhilCollooru Can we add a test cases which verifies the input data size?

[NikhilCollooru]

@NikhilCollooru Can we add a test cases which verifies the input data size?

done.