StorageConfigInfo should be optional for EXTERNAL catalogs #2356
Description
Describe the bug
Currently, StorageConfigInfo is required for both INTERNAL and EXTERNAL catalogs.
However for federated catalogs, Polaris does not need this information since it can access it from the source of truth catalog. To fix this issue we need to change the API spec as well as Polaris Server validations during CreateCatalog requests.
Once that is done, we no longer need to set the ALLOW_OVERLAPPING_CATALOG_URLS in the regression/integration tests for catalog federation.
To Reproduce
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Actual Behavior
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Expected Behavior
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Additional context
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System information
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