[native] feat: Change storage stats to per call instead per driver

[vhsu14]

Summary: Update connector functions to match facebookincubator/velox#14950

Differential Revision: D83300734

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Align connector runtimeStats implementations with upstream Velox changes by replacing per-driver RuntimeCounter metrics with per-call RuntimeMetric in SystemConnector and ArrowFlightConnector.

File-Level Changes

Change	Details	Files
Switch runtimeStats return type to RuntimeMetric for connectors	Modify SystemConnector::runtimeStats signature to return unordered_map<string, RuntimeMetric> Modify ArrowFlightConnector::runtimeStats signature to return unordered_map<string, RuntimeMetric>	presto-native-execution/presto_cpp/main/connectors/SystemConnector.h presto-native-execution/presto_cpp/main/connectors/arrow_flight/ArrowFlightConnector.h

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@vhsu14 has exported this pull request. If you are a Meta employee, you can view the originating diff in D83300734.

[sourcery-ai]

Hey there - I've reviewed your changes and they look great!

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