chore(plugin-restify): send body in event.request

[djskinner]

Goal

Send the body (if any) as event.request.body. This fixes a bug where the request body was not being included (not even as event.metadata.request.body. This was because those values were being determined when the requestHandler middleware was run, which would be before any body parsing middleware is added, as per our integration instructions, which suggest adding the Bugsnag middleware first.

The changes here are similar to #1292

Design

Better agreement with the notifier spec.

Changeset

• Collect event data at the right time (on the error handler)
• Send body as event.request.body

Testing

• Covered with E2E test
• Tested using a modified version of the example project after deploying to a local verdaccio instance and depending on that. verified the request body is included in the request tab of the event

[github-actions]

@bugsnag/browser bundle size diff

	Minified	Minfied + Gzipped
Before	42.31 kB	12.94 kB
After	42.31 kB	12.94 kB
±	No change	No change

code coverage diff

Coverage values did not change👌.

Total:

Lines	Branches	Functions	Statements
0%(+0%)	0%(+0%)	0%(+0%)	0%(+0%)

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