feat: Add optional Neptune Analytics graph backend for mem0_memory tool

[andy-k-improving]

Description

This PR adds support for optional Neptune Analytics graph backend settings in the mem0_memory tool through environment variables, allowing users to configure additional Neptune Analytics graph backend to enhance the memory search.

Documentation PR

strands-agents/docs#222

Changes made

• Add support for NEPTUNE_ANALYTICS_HOST for mem0 tool
• Associated test to assert the client setup
• Documentation to explain the usage of NEPTUNE_ANALYTICS_HOST

Testing

hatch test tests/test_mem0.py -v  # All mem0 tests pass
hatch test                       # Full test suite passes
hatch run prepare     

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[andy-k-improving]

@mehtarac wonder would that be possible to have a look on this?
This is similar to the past mem0 PR, ex: #221
Thanks!

[andy-k-improving]

@Unshure would you mind to have a look?
This should be a quick one, thanks!

[andy-k-improving]

Hi @mehtarac , I believe this build failure is caused by #237
and I have rebase my PR for this the purpose, would you mind to trigger the build again and review the PR?
Thansk!

[mehtarac]

Adding for visibility: The documentation found for Neptune analytics with mem0 memory - https://docs.mem0.ai/open-source/graph_memory/overview#initialize-neptune-analytics

[andy-k-improving]

@mehtarac Thx for the review, regarding the next step, would you mind to trigger the integration test?

[andy-k-improving]

@zastrowm Thx, would you mind to also merge strands-agents/docs#222 which is the doc this PR.