Changes related to compatibility info require changes in
Flutter engine libraries. This CL adds null-asserts wherever
necessary to maintain behavior and adds some small modifications
to handle the change in nullability. Warnings about unnecessary
null assertions are disabled temporarily in this CL as well.
Original issue: https://github.com/dart-lang/sdk/issues/41905
* Reland "add limited analysis options (#17332)"
This time I'm starting without Cirrus. Will add Cirrus serpartely from code changes.
This reverts commit 6d33ee1a2ca7d404ebd5cb434d8ab859bf8ac0b7.
* disable Cirrus analysis check
