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 96.63%. Comparing base (7af52e4) to head (d823c5b).

Additional details and impacted files

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##           develop    #7917   +/-   ##
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  Coverage    96.63%   96.63%           
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  Files          284      284           
  Lines        14105    14105           
  Branches      1162     1162           
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  Hits         13630    13630           
  Misses         345      345           
  Partials       130      130           

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[svozza]

Suggested change

	Parameters utility works correctly, but be aware that **cache is per-process**.
	Parameters utility works as expected, but be aware that **caching is per-process**.

[dreamorosi]

Left a few comments, great work so far, thanks for leading the way

[leandrodamascena]

Thanks everyone for the feedback! I'm addressing all of them and need some time to finish.

[kishaningithub]

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

[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

[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]

I think with this example it could be good to call out that the ordering of decorators matters.

We should use @idempotency always on top of @durable_exection, right?

[phipag]

Or we add it to the FAQ?

[phipag]

Question: Do need to add @logger.inject_lambda_context here?

[phipag]

Same comment regarding @logger.inject_lambda_context. Is this needed here?

[phipag]

Suggested change

	```python hl_lines="9 15" title="Using Idempotency with Durable Functions"
	```python hl_lines="8 15" title="Using Idempotency with Durable Functions"