fix(blob): support blob-only writes and reject nested blob fields - #429
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Purpose
Linked issue: #283
This PR improves BLOB schema validation and data-evolution partial writes.
ARRAY<BLOB>, which is supported by Java Paimon but not yet supported by Paimon C++.first_row_id.Tests
ArrowSchemaValidatorTest.TestBlobFieldMustBeTopLevel
BlobUtilsTest.SeparateBlobArray
AppendOnlyWriterTest.TestWriteWithOnlyBlobField
BlobTableInteTest.TestDataEvolutionBlobOnlyWriteWithFirstRowId
BlobTableInteTest.TestDataEvolutionBlobOnlyFirstCommitFailsWithoutFirstRowId
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