docs: adding new Lambda features

[leandrodamascena]

Issue number: closes #7915

Summary

This PR adds documentation for two new Lambda features: Lambda Managed Instances and Durable Functions.

Changes

I created a new lambda-features section in the docs with two pages:

Lambda Managed Instances

• Explains the multi-process concurrency model used by Python runtime
• Shows how each Powertools utility works (Logger, Tracer, Metrics, Parameters, Idempotency, Batch)
• FAQ addressing common questions about cache behavior, thread safety, etc.

Durable Functions

• Documents the native integration between Powertools Logger and the Durable Execution SDK via context.set_logger()
• Explains log deduplication during replays
• Shows how to use Tracer, Metrics, Idempotency, Parser, and Parameters
• Clarifies when to use Powertools Idempotency vs built-in step idempotency (ESM triggers, methods you don't want as steps)

The idea here is to create those pages as integration guides, not feature documentation. They follow a different structure than core utilities because:

1/ The focus is "how Powertools works with X" rather than "how to use Powertools feature Y"
2/ Current customers that users Powertools should find guidance on Powertools compatibility with those new features
3/ The content is more about considerations and gotchas than step-by-step tutorials

User experience

Please share what the user experience looks like before and after this change

---

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[sonarqubecloud]

Quality Gate failed

Failed conditions
2 Security Hotspots
C Reliability Rating on New Code (required ≥ A)

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.68%. Comparing base (4cb9997) to head (463ec38).
⚠️ Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #7917   +/-   ##
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  Coverage    96.68%   96.68%           
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  Files          285      285           
  Lines        14187    14187           
  Branches      1175     1175           
========================================
  Hits         13717    13717           
  Misses         341      341           
  Partials       129      129           

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[leandrodamascena]

@leandrodamascena Any updates on the above? Would be great to have documentation on durable function support

Hey @kishaningithub! We are working to merge this.

[phipag]

LGTM.

a

[leandrodamascena]

Hey @svozza can you pls approve this?

[svozza]

One tiny comment, all good otherwise.

[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud