docs(agents): document replay-aware logging for DurableAgent

[Rishabh-git10]

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Description

Added a "Replay-Aware Logging" subsection to the DurableAgent core concepts documentation. This details the usage of the new ContextAwareLogger utility, explaining how it hooks into the DaprWorkflowContext to seamlessly suppress duplicate log records during workflow state rehydration.

Issue reference

Relates to implementation in dapr/dapr-agents#225

[nelson-parente]

Pre-review for @marcduiker handoff: LGTM with nits.

• The replay-aware logging subsection is a useful addition for DurableAgent users.
• The code example is Python and correctly uses get_context_aware_logger from dapr_agents.utils.
• Nit: double blank line before ## Core Agent Features heading (cosmetic).
• Nit: the @workflow_entry decorator shown in the example isn't imported — consider adding the import or removing the decorator if it's just illustrative, to avoid reader confusion.
  Nothing blocking — Marc, your call.

[Rishabh-git10]

Thanks for the review @nelson-parente. I've addressed the nits just in case.
Ready for you, @marcduiker.