Add expression and requirement type columns to compliance requirements table

Description

1. We've want to add the ability to define internal checks and external checks. A proposal is drafted in gitlab-com/content-sites/handbook!8193 (merged).
2. We also need to store results of these checks only for the projects that have these checks defined, therefore, we'll be creating a new database table named project_compliance_configuration_status for storing results for these requirements.

Proposal

1. To allow us to go in that state we need the following columns to be added inside the compliance_requirements table.
2. We would drop the compliance_checks table as we would only use compliance_requirements table.

Column	Type
requirement_type	smallint
expression	jsonb

2. Also create project_compliance_configuration_status table with the following schema

Column	Type
id	bigint
created_at	timestamp
updated_at	timestamp
project_id	bigint
namespace_id	bigint
compliance_requirement_id	bigint
status	smallint