[Enhancement] (nereids)implement DropRepositoryCommand in nereids

[LiBinfeng-01]

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Description

DropRepositoryCommand is implemented in the legacy planner but unsupported in Nereids. You’ll need to migrate it. Check DorisParser.g4 for the syntax and DropRepositoryStmt.java in the legacy planner for functionality details.

unsupportedDropStatement : DROP REPOSITORY name=identifier

Solution

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[Vallishp]

I will pick it