[Enhancement] (nereids)implement CreateRoleCommand in nereids

[LiBinfeng-01]

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Description

CreateRoleCommand is supported in legacy planner but not in nereids(new doris fe planner). you need implement it in nereids.
The DorisParser.g4 has the syntax definition already(see bellow). And you can check CreateRoleStmt.java in legacy planner to see what the command does and migrate it to nereids planner
unsupportedCreateStatement: CREATE ROLE (IF NOT EXISTS)? name=identifier (COMMENT STRING_LITERAL)?

Solution

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• Yes I am willing to submit a PR!

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[Vallishp]

i will pick it