[pkg/ottl] Add `IsInt` Converter

[TylerHelmuth]

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Component(s)

pkg/ottl

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

OTTL has no way to check if a value is an int type.

Describe the solution you'd like

Add a new Converter, IsInt that returns true if the given type is a int (or equivalent type). It will work similarly to the IsString function.

The implementing PR should

• [ ] Implement the function
• [ ] Add new unit tests for the function
• [ ] Add the function to pkg/ottl/ottlfuncs/functions.go
• [ ] Update the README at pkg/ottl/ottlfuncs/README.md

[swar8080]

Would this just match on any of the built-in int types and pcommon.ValueTypeInt? Or could it include values like 2.0 and "2"?

Also, maybe an IsNumber/IsNumeric function is helpful for when it's unclear if instrumentation emits integers or doubles

[lazyplatypus]

i'm interested in working on this issue :)

[codeboten]

Thanks @lazyplatypus, its all yours!

[github-actions[bot]]

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[lkwronski]

It can be closed because the #31307 was merged.