Return callback value from contextualize plugin

[gingerbenw]

Goal

This PR modifies the contextualize plugin to return the value from the callback function, enabling proper value propagation through the contextualized scope. Previously, the plugin did not return the callback's result, making it impossible for callers to retrieve values from wrapped functions. This change resolves issue #2651

Changeset

• Added return statement to propagate callback function's return value
• Updated CHANGELOG

Testing

Added comprehensive test coverage for return value behavior and async operations

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	47.74 kB	14.17 kB
After	47.74 kB	14.17 kB
±	No change	No change

code coverage diff

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