Include check constraints in structure.sql

[benny-burkhart]

Steps to reproduce

In an app, in a migration, specify a check constraint, along these lines:
ActiveRecord::Base.connection.execute('ALTER TABLE test_posts add CONSTRAINT foo_is_json CHECK(foo is json)')

Configure the app to use schema format SQL. In config/application.rb specify:
config.active_record.schema_format = :sql

Expected behavior

After a db:migrate, the alter table ... add constraint ... check ... should appear in db/structure.sql.

Actual behavior

The constraint is omitted.

System configuration

Rails version: 6.1.4.1

Oracle enhanced adapter version: 6.1.4

Ruby version: 2.7.4p191

Oracle Database version: 19c enterprise