fix: publish source and include sourcemaps

[kettanaito]

• Fixes Remix Error: ENOENT: no such file or directory, open '.../node_modules/msw/lib/core/handlers/RequestHandler.mjs.map' #1946
• Exports sourcemaps with the build. Modern tooling, like Remix, requires sourcemaps for server builds.
• Updates @mswjs/interceptors to the version that also ships sourcemaps https://github.com/mswjs/interceptors/releases/tag/v0.25.14
• Publishes src to NPM to sourcemaps would point to existing source files.

Note: no need to force ESM extensions in sourcemaps because they always point to the source *.ts files that are not modified by anything.

[kettanaito]

Released: v2.0.13 🎉

This has been released in v2.0.13!

• 📄 Release notes
• 📦 npm package

Make sure to always update to the latest version (npm i msw@latest) to get the newest features and bug fixes.

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