[ddc] Default native null asserts on in sound mode This does not necessarily enable the native null assertions by default everywhere but it is a step on the path to get there. - The calls to the method that reads this value are only generated in sound null safety so even if this is true the checks don't happen in weak null safety. Added a warning when the option is enabled in weak null safety. - Many DDC integrations will set the flag manually during the bootstrap. That setting still overrides the default value being changed here. Change-Id: I4459fb8e8928424b461eb5519f3a7dc87c578172 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/286606 Reviewed-by: Mark Zhou <markzipan@google.com> Commit-Queue: Nicholas Shahan <nshahan@google.com>
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