[Enhancement] (nereids)implement dropDatabase command in nereids

[LiBinfeng-01]

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Description

DropDatabaseCommand is supported in the legacy planner but not in Nereids (the new Doris FE planner). You need to implement it in Nereids. The syntax definition for this command is in DorisParser.g4. Refer to DropDbStmt.java in the legacy planner for its functionality.

unsupportedDropStatement : DROP (DATABASE | SCHEMA) (IF EXISTS)? name=multipartIdentifier FORCE?

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[felixwluo]

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