feat(paimon-core): Add test cases for TableScan partition, bucket, level filters and list APIs

[fightBoxing]

Summary

Add comprehensive test cases for TableScan in paimon-core to improve coverage for InnerTableScan interface methods.

Changes

• Add testPartitionFilter: Test partition filter with Map and BinaryRow
• Add testBucketFilter: Test withBucket and withBucketFilter methods
• Add testLevelFilter: Test level filter for primary key table
• Add testListPartitionEntries: Test listPartitionEntries and listPartitions APIs
• Add testPrimaryKeyTableScan: Test scan with update and delete operations
• Add testEmptyTableScan: Test scan behavior on empty table
• Add testScanWithMultipleFilters: Test combination of partition and column filters
• Add testLimitWithPartitionFilter: Test limit pushdown with partition filter
• Add testScanAfterCompaction: Test scan result after compaction
• Add testTopNWithPartitionFilter: Test TopN with partition filter combination

API Coverage

• withPartitionFilter, withBucket, withBucketFilter, withLevelFilter
• listPartitionEntries, listPartitions