[MDEV-20735] Allow non-reserved keywords as user defined type names - Jira

This task is similar to ~~MDEV-20734~~, but for non-reserved keywords.

To avoid compatibility problems in the future, let's allow non-conflicting non-reserved keywords as user defined type (UDT) names.

The non-reserved keywords from the following rules will be allowed:

non_reserved_keyword_udt:

          keyword_sp_var_not_label

        | keyword_sp_head

        | keyword_verb_clause

        | keyword_set_special_case

        | keyword_sp_block_section

        | keyword_sysvar_type

        | keyword_sp_var_and_label

Non-reserved keywords from these rules won't work as UDT names, because they'd cause grammar conflicts:

keyword_data_type:

          BIT_SYM

        | BOOLEAN_SYM

        | BOOL_SYM

        | CLOB_MARIADB_SYM

        | CLOB_ORACLE_SYM

        | DATE_SYM           %prec PREC_BELOW_CONTRACTION_TOKEN2

        | DATETIME

        | ENUM

        | FIXED_SYM

        | JSON_SYM

        | MEDIUM_SYM

        | NATIONAL_SYM

        | NCHAR_SYM

        | NUMBER_MARIADB_SYM

        | NUMBER_ORACLE_SYM

        | NVARCHAR_SYM

        | RAW_MARIADB_SYM

        | RAW_ORACLE_SYM

        | ROW_SYM

        | SERIAL_SYM

        | TEXT_SYM

        | TIMESTAMP          %prec PREC_BELOW_CONTRACTION_TOKEN2

        | TIME_SYM           %prec PREC_BELOW_CONTRACTION_TOKEN2

        | VARCHAR2_MARIADB_SYM

        | VARCHAR2_ORACLE_SYM

        | YEAR_SYM

keyword_cast_type:

          SIGNED_SYM

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