Write commands of types DDL, DML, DCL, TCL
Asked in the Technical stage. Implement a Python function that returns representative SQL commands grouped by these four command types. Use the supplied safe table name in every table-specific command.
table_name is a lowercase identifier containing letters and underscores. Return a dictionary with keys DDL, DML, DCL, and TCL. Each value must be a list of SQL command strings.
def generate_sql_commands(table_name):