Research and compare new rover persisted query manifest generator with npm package

Rover has a new pq manifest generate command. We need to test it to see if it covers what we expect from the Apollo Client side so that we can deprecate the existing @apollo/generate-persisted-query-manifest npm package.

Some things we will need to check:

• Apollo Client v3 compatibility (addTypename controls whether __typename is added)
• Apollo Client v4 compatibility (__typename is always added)
• Custom document transforms
• What docs replacements we would need

My biggest concern is custom document transforms capability. I know of at least one business entity that relies heavily on them.