[~] Add CheckConstraintFormatter and SQL wrapper

[marikrebega]

This PR introduces support for annotating models with database Check Constraints and improves the formatting logic for long SQL expressions.

Changes:

• Added CheckConstraintFormatter to extract and display check constraints in model annotations.
• Extracted shared wrapping logic into Annotato::WrapHelper to reduce duplication between index and check constraint formatting.
• Added specs for CheckConstraintFormatter and updated existing specs.

Example output:

# == Annotato Schema Info
# Table: users
#
# Columns:
#  id     :bigint  not null, primary key
#  status :integer default("draft"), not null, enum
#
# Enums:
#  status: {
#    draft (0),
#    published (1)
#  }
#
# Indexes:
#  index_users_on_email (email) unique
#
# Triggers:
#  audit_trigger_row
#
# Check Constraints:
#  chk_valid_status
#    (((((status)::text = 'deleted'::text) AND
#    (deleted_at IS NOT NULL)) OR (((status)::text <> 'deleted'::text) AND
#    (deleted_at IS NULL) AND (active = true))))