Add correct project references for apollo-server-cloud-functions. (#1948)

* Add correct project references for `apollo-server-cloud-functions`.

The `apollo-server-cloud-functions` has been been mis-referenced (or
referenced inconsistently) since its original inception in #1446 when its
package directory was `apollo-server-cloud-function` (singular!) and the
`package.json` referenced the plural form (`apollo-server-cloud-functions`):

724d9ff0#diff-e1d725fd66f7e9ef5251abf0437a09ca

These references have been mostly fixed in the READMEs and supporting
documentation, but the underlying monorepo directory structure has still not
been fixed, which I'm sure contributed to this module being overlooked and
unreferenced in the move to TypeScript project references in #1772.

Additionally, the lack of referencing in the monorepo's TS config has
resulted in it being broken in the most recent 2.2.0 release, as reported by
@pyros2097 and @thetre97 in: #1896 (comment)

This should fix that by properly adding the TypeScript project references.

* Sorting.

Author: abernix

package-lock.json

@@ -45,6 +45,7 @@
     "apollo-server-cache-memcached": "file:packages/apollo-server-cache-memcached",
     "apollo-server-cache-redis": "file:packages/apollo-server-cache-redis",
     "apollo-server-caching": "file:packages/apollo-server-caching",
+    "apollo-server-cloud-functions": "file:packages/apollo-server-cloud-functions",
     "apollo-server-cloudflare": "file:packages/apollo-server-cloudflare",
     "apollo-server-core": "file:packages/apollo-server-core",
     "apollo-server-env": "file:packages/apollo-server-env",