fix parser to handle unique constraint names properly #225
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support these statements:
alter table <table_name> add constraint unique (<column_list>)
alter table <table_name> add constraint <name> unique (<column_list>)
alter table <table_name> add constraint unique <name> (<column_list>)
alter table <table_name> add constraint <name> unique <preferred_name> (<column_list>)
fix for: dolthub/dolt#5479