Fix type annotations in OracleOperator, JdbcOperator, SqliteOperator #17406
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Each SQL Operator that uses 'run' method from DbApiHook can receive a str representing a sql statement, a list of str (sql statements), or reference to a template file.
But type annotations in OracleOperator, JdbcOperator and SqliteOperator are 'str' only.
This leads to misunderstandings in IDE if list was used.
^ Add meaningful description above
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