[python] Add drop_partitions support to FileSystem catalog and CLI#7911
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Implement drop_partitions() in FileSystemCatalog following the same pattern as RESTCatalog: get table, create BatchTableCommit, call truncate_partitions. Add 'paimon table drop-partition' CLI command that accepts one or more --partition flags with key=value specs.
JunRuiLee
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Purpose
Add drop_partitions support for the Python FileSystem catalog and expose it through the PyPaimon CLI, aligned with the Java implementation by using the table batch commit path and truncate_partitions semantics to generate an overwrite commit that removes the specified partition data.
Tests
Added coverage for: