add pg_enum table

[madesroches-ubi]

adding this table does not allow powerbi to connect... but the error is more interesting

DataFusion fails executing this query:

SELECT pg_type.oid, enumlabel
FROM pg_enum
JOIN pg_type ON pg_type.oid=enumtypid
ORDER BY oid, enumsortorder

Détails : « PostgreSQL : XX000: Ipc error: Status { code: Internal, message: "Error executing plan: Context(\"SanityCheckPlan\", Plan(\"Plan: [\\\"SortExec: expr=[oid@0 ASC NULLS LAST, enumsortorder@2 ASC NULLS LAST], preserve_partitioning=[false]\\\", \\\"  ProjectionExec: expr=[oid@0 as oid, enumlabel@2 as enumlabel, enumsortorder@1 as enumsortorder]\\\", \\\"    CoalesceBatchesExec: target_batch_size=8192\\\", \\\"      HashJoinExec: mode=CollectLeft, join_type=Inner, on=[(oid@0, enumtypid@0)], projection=[oid@0, enumsortorder@2, enumlabel@3]\\\", \\\"        DataSourceExec: partitions=1, partition_sizes=[1]\\\", \\\"        DataSourceExec: partitions=0, partition_sizes=[]\\\"] does not satisfy distribution requirements: SinglePartition. Child-0 output partitioning: UnknownPartitioning(0)\"))", metadata: MetadataMap { headers: {"content-type": "application/grpc", "date": "Wed, 09 Jul 2025 20:06:42 GMT", "content-length": "0"} }, source: None } »
```

[sunng87]

@madesroches-ubi the query issue should be fixed in #109 by @waynexia