node: TypeScript and rollup

[djskinner]

Goal

Convert @bugsnag/node to TypeScript and bundle with rollup, replacing the browserify bundling.

Design

Consistency with new approach to other packages. Needed doing before the @bugsnag/core conversion because browserify does not understand package.exports (see #2296).

Testing

e2e tests passing

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	50.02 kB	15.41 kB
After	50.02 kB	15.41 kB
±	No change	No change

code coverage diff

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Generated by 🚫 dangerJS against 697fc01

[djskinner]

I've reverted how the version handling is done across all packages because I'd misunderstood how it was working. As can be seen below the version is injected inside a string rather than as a variable. This is how it was done before. The problem with it being a variable is that outside of rollup you can't import or require the file without somehow defining the global variable first. This is done in some of the integration tests for example.

[djskinner]

As mentioned before, the root tsconfig.json has "types: ["jest"], which excludes other types - but we need @types/node here hence why it is redefined.

It would be better to remove "types: ["jest"] from the root tsconfig.json but doing so means that @types/react-native are also included, which then conflict with lib dom, as defined by "lib": [ "dom", "esnext" ],.

So to do that we'll need to restructure the way jest / typescript is set up. One for a later PR.