Feat/file catalog #44
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This PR add a "File" catalog. It makes use of Iceberg file system tables and doesn't require an external catalog. This is possible because S3 now supports conditional writes.
The table identifiers are converted to and from the table locations in object-storage. It always uses the last 3 parts of the table location prefix. For example:
s3://warehouse/staging/inventory/orders <-> staging.inventory.orders
s3://warehouse/cleaned/events <-> warehouse.cleaned.events