Support precision operator in the pmetricassert for datapoints

[ravishankar-sumo]

Component(s)

pkg/pdatatest

Is your feature request related to a problem? Please describe.

Following up from 48079

Add support for /precision<number> like,
/precision3 supports till 3 precisions
/precision2 supports till 2 precisions

to support the existing IgnoreMetricFloatPrecision frompkg/pdatatest/pmetrictest/options.go

Describe the solution you'd like

Follow the similar pattern of exist check Ref and add functionality for precision3

Describe alternatives you've considered

No response

Additional context

No response

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[github-actions]

Pinging code owners:

• pkg/pdatatest: @fatsheep9146

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[ravishankar-sumo]

/label -needs-triage