[FEATURE] support external Iceberg format for generic catalog
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feature
- Dominant language
- Java
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- Avg merge
- 1d 16h
- Merged PRs (30d)
- 298
Description
### Describe the feature
Gravitino generic catalog only support lance format, it's better to support Iceberg format for the generic catalog
### Motivation
_No response_
### Describe the solution
_No response_
### Additional context
_No response_
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