TSQL: Add `BULK INSERT` support

[SimeonStoykovQC]

Following

https://learn.microsoft.com/en-us/sql/t-sql/statements/bulk-insert-transact-sql?view=sql-server-ver16#syntax

I have something like this in mind (todo: options):

dml_clause
    : merge_statement
    | delete_statement
    | insert_statement
    | select_statement_standalone
    | update_statement
    | bulk_insert_statement
    ;
...
bulk_insert_statement
    : BULK INSERT
    ddl_object
    FROM STRING
    ;

Let me know if there is something to consider. Happy to open a PR in the next few days.