fix: ensure thread-safe handling of streams in AWSIoT components

[zhouzh1]

Issue #, if available:

None

Description of changes:

Actually I already submitted a PR several months ago, but it got declined because of the code change in it is not really able to resolve the issue, but you can get the issue details from that PR.

As for the code change in this PR, I already applied it in our release app for nearly a quarter by creating a pod patch, I can sure it's able to resolve the corresponding issue because we haven't observed the corresponding error report in both Sentry and Xcode crash statistics anymore, but I am not sure if it's the most optimal solution, so please help take a look.

Check points:

• Added new tests to cover change, if needed
• All unit tests pass
• All integration tests pass
• Updated CHANGELOG.md
• Documentation update for the change if required
• PR title conforms to conventional commit style

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[zhouzh1]

@mattczech @lyricsboy @hughescr @orta Hey guys, anybody can help review this PR so that we can get rid of the pod patching? Thanks.

[zhouzh1]

@awsmobilesdk review, please~

[zhouzh1]

@palpatim @lawmicha Could you help take a look at this PR?