Tests for Fastify plugins

[madflow]

This PR

• Adds a test to check if Fastify plugins do their job when used as http server

• Bumps Fastify to the latest version and installs fastify-helmet and fastify-compress as dev dependencies

• The fastify-compress test is failing. It does pass when the compress middleware is used instead of the plugin

• See Fastify plugins integration #1220

[benjie]

In koa we had to hack around it like this: https://github.com/graphile/postgraphile/blob/d9d5c59d106a54612fb3738003b7e631ab6d062e/src/postgraphile/http/koaMiddleware.ts#L19-L46

Maybe a similar hack would work for fastify? It might be that we should use res.send() rather than res.end() here, and then call res.end() separately?

https://github.com/graphile/postgraphile/blob/d9d5c59d106a54612fb3738003b7e631ab6d062e/src/postgraphile/http/createPostGraphileHttpRequestHandler.ts#L895

[madflow]

Maybe a similar hack would work for fastify? It might be that we should use res.send() rather than res.end() here, and then call res.end() separately?

I do not know unfortunatly. Regarding the res.send(): ServerResponse does not have a send method. Is there more refactoring implied or am I missing something?

[benjie]

Oh yeah, res.send is an Express API. We'd need to figure out what fastify compress is expecting and then use that.