Daniel Weeks

Add Iceberg RESTSessionCatalog Implementation

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## Description This PR adds and the REST Catalog implementation for Iceberg. > Is this change a fix, improvement, new feature, refactoring, or other? New Feature / Improvement > Is...

JDBCCatalog does not check for namespace existence on table create

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### Feature Request / Improvement The JDBCCatalog silently creates namespaces if used in a create statement. This is non-standard and can result in surprising behavior due to simple typos in...

Incorrect Base64 encoded x-amz-content-sha256 value

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### Describe the bug SigV4 Signing produces incorrect value for checksum header This [line in AbstractAws4Signer](https://github.com/aws/aws-sdk-java-v2/blob/master/core/auth/src/main/java/software/amazon/awssdk/auth/signer/internal/AbstractAws4Signer.java#L452) is producing base64 encoded values for the `x-amz-content-sha256` header instead of the required "Lowercase...

Core: validate file format compatibility with v3

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Parquet is currently the only file format that supports all the required capabilities for v3 compatibility. This PR adds validation/tests to prevent unintentionally creating or upgrading a table to v3...