proposal to detach children before self

[davissuber]

This pull request stems from https://github.com/uber/RIBs/issues/589 and attempt to swap the detachment order between self and any attached children to avoid a small window in which the child is active and parent is not.

Note that this only updates the Android part - the corresponding iOS behavior remains "detach self before children" even after this pull request.

[tyvsmith]

Has this been verified in the Uber monorepo? Tests passed and apps worked?

[davissuber]

Has this been verified in the Uber monorepo? Tests passed and apps worked?

No, not yet - was creating this pull request to collect information on whether to do this at all (and if yes, gather information on what would be considered a sufficient test)

[tyvsmith]

Suggest a first pass with a custom built dependency to understand the scope of the migration

[davissuber]

Update: After smoke testing with Uber's big apps, decided to limit the change to only move the "detach self" ahead of "detach children" and leave the "will detach" position untouched