Prometheus fix for count(*)

[lukmanulhakkeem]

Description

In this Presto pull request, we are addressing the issue where a SELECT count(*) query returns an empty columnHandles list, leading to an ArrayIndexOutOfBoundsException when the function columnHandles.get(0).getColumnType() is called. To handle this, we are bypassing the conversion from metricHeader to a Block type (performed by the getBlockFromMap function at line 293 in PrometheusRecordCursor.java). We are modifying the constructor of PrometheusStandardizedRow to accept a Map type rather than a Block. The conversion to BlockFromMap is now deferred to the getFieldValue function, where getLabels() is used.

Honoring the Trino PR: trinodb/trino#12510

Motivation and Context

#23702

Impact

Test Plan

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[agrawalreetika]

@lukmanulhakkeem Please sign a CLA, its needed for the first PR - https://github.com/prestodb/presto/blob/master/CONTRIBUTING.md#contributing-to-presto