[ddc] Migrate shared_command to null safety Update CFE API for ddc to mirror the nullability of fields in `CompilerOptions`. Issue: https://github.com/dart-lang/sdk/issues/46617 Change-Id: I08d8cc2c5bb1dba4823cb3a7e1f4a540fb3bfef5 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/248181 Commit-Queue: Nicholas Shahan <nshahan@google.com> Reviewed-by: Mark Zhou <markzipan@google.com> Reviewed-by: Johnni Winther <johnniwinther@google.com>
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