Add path aliases for cleaner imports

[matux]

Description of the change

I was getting tired of the relative subdirs when doing imports and checked if there's an idiomatic way of improving how we can refer to different paths without crawling for directories. Turns out there's, path aliases.

Added some configuration and updated the imports and it seems to be working just fine. Although I don't know if this could generate other issues for SDK users.

Note

I didn't change all the files, just the ones I've been working with recently, just as a PoC. If you guys want, I can propagate this to the rest of the SDK.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Maintenance
• New release

[Copilot]

Pull Request Overview

This PR introduces path aliases to simplify module imports and reduce reliance on relative paths.

• Updated webpack and karma configurations to include new alias settings.
• Revised various test files to use alias-based imports instead of relative paths.
• Adjusted source files to align with the new alias configuration.

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
webpack.config.js	Added alias configurations in multiple build config sections.
test/replay/unit/replayMap.test.js	Updated import paths to use new alias syntax.
test/replay/unit/queue.replayMap.test.js	Changed require statement to use the new '@rollbar/queue' alias.
test/replay/unit/api.postSpans.test.js	Updated require statement to leverage the '@rollbar/api' alias.
test/replay/integration/sessionRecording.test.js	Revised multiple import paths to new alias-based imports.
test/replay/integration/replayMap.test.js	Updated import paths for consistency with alias configuration.
test/replay/integration/queue.replayMap.test.js	Adjusted import paths to use alias references.
test/replay/integration/e2e.test.js	Modified import paths to reference modules via aliases.
test/replay/integration/api.spans.test.js	Changed require statement to use the '@rollbar/api' alias.
src/browser/replay/replayMap.js	Updated import to use new alias for the exporter module.
karma.conf.js	Integrated alias configuration into the Karma Webpack config.