Updated middleware execution to provide new functionality

[BlenderDude]

Short circuit middleware execution

You can now opt to return a Lambda result object directly from the middleware. This will cancel the middleware chain, bypass GraphQL request processing, and immediately return the Lambda result.

Example

export const handler = startServerAndCreateLambdaHandler(
  server,
  handlers.createAPIGatewayProxyEventV2RequestHandler(),
  {
    context: async () => {
      return {};
    },
    middleware: [
      async (event) => {
        const psk = Buffer.from('SuperSecretPSK');
        const token = Buffer.from(event.headers['X-Auth-Token']);
        if (
          psk.byteLength !== token.byteLength ||
          crypto.timingSafeEqual(psk, token)
        ) {
          return {
            statusCode: '403',
            body: 'Forbidden',
          };
        }
      },
    ],
  },
);

Closes #102

Closes #108

Closes #97

Closes #85

Closes #84

[changeset-bot]

🦋 Changeset detected

Latest commit: 122430d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@as-integrations/aws-lambda	Minor

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Sandbox	Source
apollo-server-integration-aws-lambda	Configuration

[trevor-scheer]

This should get a README update as well, but I don't see anything major!

[trevor-scheer]

V3! 🚂