add: doPrivileged

[PauiC]

Description

Fixed SecurityException when executing Bedrock streaming requests by wrapping the BedrockRuntimeAsyncClient creation with AccessController.doPrivileged(), allowing the AWS SDK to read credentials from ~/.aws/credentials despite OpenSearch's security manager restrictions.

Related Issues

Resolves #[Issue number to be closed when this PR is merged]

Check List

• New functionality includes testing.
• New functionality has been documented.
• API changes companion pull request created.
• Commits are signed per the DCO using --signoff.
• Public documentation issue/PR created.

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✨ Finishing touches

🧪 Generate unit tests (beta)

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[Hailong-am]

LGTM, 👍