[apollo-server-lambda] Add support for isBase64Encoded

[styfle]

This PR adds support for Lambda Proxy when isBase64Encoded: true.

The body must be decoded from base64 before parsing JSON.

https://docs.aws.amazon.com/apigateway/latest/developerguide/set-up-lambda-proxy-integrations.html

[apollo-cla]

@styfle: Thank you for submitting a pull request! Before we can merge it, you'll need to sign the Apollo Contributor License Agreement here: https://contribute.apollographql.com/

[styfle]

@abernix Is there something wrong with Netlify? The previous commit (5935c81) was passing CI but the changelog commit you added (e621ccb) is now failing CI 🤔

[abernix]

LGTM! I had to sort out the Netlify build thing — which turns out to be actually affecting the entire repository, not just this PR. As you noted, I added a CHANGELOG.md entry, but now I think this is good to go. Thanks! 😄

[styfle]

@abernix Great, thanks!

What's the best way to get notified when this is released?

I subscribed to GitHub Releases on this repo but it doesn't look like they are used, only tags.

[abernix]

@styfle I put it on the milestone (2.16.0) where I believe it'll land. I try to drop messages on PRs within a release when the release ships, based on that milestone's contents — It's a manual ergonomic, but not usually too hard for me to remember. 😉

It probably won't be this week — since it'd be great to get a few more things into this release — but I'm trying to get some triaging and releasing done before Tuesday!

[styfle]

@abernix Makes sense!

I only see one item in the 2.16.0 Milestone so that should easy enough 😉

Looking forward to this release, thanks 👍

[abernix]

📣 Published in apollo-server-lambda@2.16.0! Thank you for putting this together.

[krailler]

Can anyone see #4430?