include import information in analyze rpc call

[devoncarew]

• include import information in analyze rpc call
• keep as optional in the call for now so that new clients can talk to old servers (for the ~8 min update period)

This does not yet switch appIsFlutter and usesPackageWeb over to this info as we need to decide whether we're just relying on this info or also using the technique of scraping DDC output (hasFlutterWebMarker).

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[devoncarew]

I may land this now - it'll be useful to have the info populated by prod servers for the client to use.