[Question] Why must metalake names be strictly alphanumeric

https://github.com/apache/gravitino/blob/58e0a2f331149ee5aefff844cd44145443423cd1/core/src/main/java/org/apache/gravitino/metalake/MetalakeNormalizeDispatcher.java#L42C1-L53C1

I guess I don't understand why the naming must be this strict, what technical reason would this preclude a name like`my_metalake-1`

Read core/src/main/java/org/apache/gravitino/metalake/MetalakeNormalizeDispatcher.java around lines 42-53 and trace where the normalized metalake name is consumed. Determine the technical rationale for the alphanumeric restriction; done means documenting that rationale and clarifying whether names such as my_metalake-1 are intentionally unsupported.

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