[Backport 2.x] Fix core refactor: StreamIO from common to core.common (#707)

[Hailong-am]

Backport fd8fe22 from #707
Backport 8efd279 from #717

[codecov]

Codecov Report

Merging #719 (fc488cf) into 2.x (df57e31) will increase coverage by 4.25%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                2.x     #719      +/-   ##
============================================
+ Coverage     61.51%   65.77%   +4.25%     
- Complexity      114      253     +139     
============================================
  Files            73       39      -34     
  Lines          2474     1677     -797     
  Branches        266      158     -108     
============================================
- Hits           1522     1103     -419     
+ Misses          775      456     -319     
+ Partials        177      118      -59     

Flag	Coverage Δ
opensearch-notifications	65.77% <ø> (+4.25%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...org/opensearch/notifications/NotificationPlugin.kt	97.43% <ø> (ø)
...pensearch/notifications/action/PluginBaseAction.kt	43.93% <ø> (+0.65%)	⬆️
...earch/notifications/index/ConfigIndexingActions.kt	60.82% <ø> (+4.14%)	⬆️
...opensearch/notifications/index/ConfigOperations.kt	0.00% <ø> (ø)
...pensearch/notifications/index/ConfigQueryHelper.kt	90.99% <ø> (ø)
...opensearch/notifications/index/EventQueryHelper.kt	0.00% <ø> (ø)
...rch/notifications/index/NotificationConfigIndex.kt	70.12% <ø> (+0.45%)	⬆️
.../org/opensearch/notifications/model/DocMetadata.kt	89.65% <ø> (ø)
...earch/notifications/model/NotificationConfigDoc.kt	100.00% <ø> (ø)
...notifications/model/SendTestNotificationRequest.kt	100.00% <ø> (ø)
... and 8 more

... and 35 files with indirect coverage changes

[Hailong-am]

security test failure due to docker image opensearchstaging/opensearch:2.10.0 don't have security plugin installed