At the moment it is not possible to add table constraints to tables during creation time.
We must extend create_table to support creating table constraint.

• Add new constraints attribute to create_table Add constraints option to create_table and unique constraint support #585
• Support unique constraints Add constraints option to create_table and unique constraint support #585
• Add support for CHECK constraints in create_table operation #588
• Add support for primary key constraints in create_table operation #594
• Add support for foreign key constraints in create_table operation #597
• Add support for exclusion constraints in create_table operation #624
• Translate constraints in CREATE TABLE statements into pgroll operations
• unify configuration options for all constraints in columns and tables
  • foreign key: Expose foreign key constraint options in inline FK definition and in create_constraint #653
  • primary key
  • unique
  • check: Add support for no_inherit on column level constraints and in create_constraint operation #670
  • deferrable column level constraints
• Add exclusion constraints to analyze/read_schema #658