13402 Converted ActivityAware and ServiceAware Lifecycles to opaque objects (#43670)

13660 Fix splash screen lookup. (#44131)

13698 Fix plugin registrant reflection path. (#44161)

13738 Removed scary experimental warnings for new embedding. (#44314)

13739 Point old plugin registry accessors to new embedding plugin accessors. (#44225)

13743 Expose asset lookup from plugin binding. (#42019)

13855 Add support for –dart-flags in FlutterShellArgs. (#44855)

13932 Removed GET_ACTIVITIES flag from all manifest meta-data lookups. (#38891)