[SNOW-TBD] AWS SDK v2 migration Step 1: Add v2 deps + migrate IcebergS3Client#1149

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aws-sdk-v2-step1-deps-and-iceberg-s3

Commits on Apr 14, 2026

Add AWS SDK v2 dependencies alongside v1

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Migrate IcebergS3Client from AWS SDK v1 to v2

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Add eventstream to ADDITIONAL_LICENSES_MAP for license processing

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Fix IcebergS3Client to match JDBC's AWS SDK v2 patterns

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Restore proxy protocol and env variable isolation in S3 proxy config

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Use v2 SSE constants and update migration plan

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Add MIT-0 license (reactive-streams) to allowed licenses

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Commits on Apr 15, 2026