[Unified SDK] TypeError: Identify is not a constructor

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## Expected Behavior

`Identify` class should be available for _identify_ event

## Current Behavior

when I use `new Identify().set`, as the documentation suggests, I'm getting an error that the class isn't a constructor. as a workaround, I imported `Identify` from `'amplitude/analytics-core'`, but I guess this is not the correct way

## Possible Solution

inside index.d.ts file, export the mentioned class (like in index.d.ts from analytics-browser)

## Steps to Reproduce

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## Environment
- JS SDK Version: 1.0.0-beta.2
- Installation Method: npm
- Browser and Version: Chrome 137