adding extra credentials argument to s3source

[mitchbregs]

Summary

Adding support for accessing S3 data with extra_credentials.

For reference: https://clickhouse.com/docs/en/cloud/security/secure-s3.

Checklist

Delete items not relevant to your PR:

• [ ] Unit and integration tests covering the common scenarios were added
• [x] A human-readable description of the changes was provided to include in CHANGELOG
• [ ] For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

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