Integrate identity chain into SDK client construction - #771
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…ted Config interface # Conflicts: # packages/smithy-core/tests/unit/aio/test_retries.py
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Description
This PR integrates the new
IdentityChaininto generated AWS clients. A newAwsIdentityIntegrationbuilds the default chain intoaws_credentials_identity_resolverat client setup.The integration also pins the identity resolver in the config's deep-copy memo (
{id(resolver): resolver}) so it's shared by reference. Every operation deep-copies the config to isolate per-call plugin mutations, which would otherwise duplicate the resolver on each call; pinning it keeps the chain built once per client and reused across every operation.Important
This branch builds on top of #758. Only the latest commit is the change under review here. Every earlier commit belongs to #758.
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