add more user based permission check in Memory

[Zhangxunmt]

Description

This PR is to add user based permission check that addresses concerns in #1901.

The permission checks are strictly applied to all interactions/conversations.

The PR is verified using two different login users and ensure they don't have access to each others's data

More tests cases added and Rebased to latest main branch.

Issues Resolved

[List any issues this PR will resolve]

Check List

• New functionality includes testing.
  • All tests pass
• New functionality has been documented.
  • New functionality has javadoc added
• Commits are signed per the DCO using --signoff

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

Codecov Report

Attention: 42 lines in your changes are missing coverage. Please review.

Comparison is base (849fecf) 82.96% compared to head (fc476ac) 82.84%.

Files	Patch %	Lines
.../opensearch/ml/memory/index/InteractionsIndex.java	71.42%	20 Missing and 6 partials ⚠️
...onversation/UpdateConversationTransportAction.java	75.00%	4 Missing and 1 partial ⚠️
...conversation/UpdateInteractionTransportAction.java	64.28%	4 Missing and 1 partial ⚠️
...y/index/OpenSearchConversationalMemoryHandler.java	28.57%	5 Missing ⚠️
...nsearch/ml/memory/index/ConversationMetaIndex.java	90.90%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1927      +/-   ##
============================================
- Coverage     82.96%   82.84%   -0.12%     
- Complexity     5424     5445      +21     
============================================
  Files           522      522              
  Lines         21781    21900     +119     
  Branches       2222     2226       +4     
============================================
+ Hits          18070    18144      +74     
- Misses         2811     2848      +37     
- Partials        900      908       +8     

Flag	Coverage Δ
ml-commons	82.84% <70.62%> (-0.12%)	⬇️

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[HenryL27]

Overall looks good, thanks for doing this.
There used to be an access test for singular get interaction - can we put it back? And maybe add some similar tests for the trace/update APIs?

[Zhangxunmt]

Overall looks good, thanks for doing this. There used to be an access test for singular get interaction - can we put it back? And maybe add some similar tests for the trace/update APIs?

Yes those tests are added. There is slightly difference for the get interaction permission check test due to the conversation id is removed after refactor. But overall this is a valid solution without adding too much latency (negligible from tests).

[HenryL27]

LGTM, thanks for adding access tests