fix(codegen): aws-query protocol, distinguish explicit empty list

[kuhe]

• set an empty array for empty list/set collections in aws query
• aims to fix client-cloudformation - Unable to remove Rollback Triggers #3896

previous

RollbackConfiguration: {
  RollbackTriggers: []
}
->
// (no serialization of this empty list)

proposed

RollbackConfiguration: {
  RollbackTriggers: []
}
->
"RollbackConfiguration.RollbackTriggers": []

[kuhe]

this change is failing a protocol test, consulting internally to reconcile

[kuhe]

the protocol test seems to have been updated, re-running checks on this PR and updated rebase

[github-actions]

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