Add supporting classes for ClickHouse migrations

db/click_house/main/20230705124511_create_events.sql

...k_house/main/20230707151359_create_ci_finished_builds.sql

...finished_builds_aggregated_queueing_delay_percentiles.sql

...n/20230724064832_create_contribution_analytics_events.sql

...64918_contribution_analytics_events_materialized_view.sql

db/click_house/main/20230808070520_create_events_cursor.sql

...ished_builds_aggregated_queueing_delay_percentiles_mv.sql

db/click_house/migrate/20230705124511_create_events.rb

...house/migrate/20230707151359_create_ci_finished_builds.rb

..._finished_builds_aggregated_queueing_delay_percentiles.rb

...te/20230724064832_create_contribution_analytics_events.rb

...create_contribution_analytics_events_materialized_view.rb

db/click_house/migrate/20230808070520_create_sync_cursors.rb

...nished_builds_aggregated_queueing_delay_percentiles_mv.rb

...rate/20231106202300_modify_ci_finished_builds_settings.rb

lib/click_house/migration.rb

lib/click_house/migration_support/migration_context.rb

lib/click_house/migration_support/migration_error.rb

lib/click_house/migration_support/migrator.rb

lib/click_house/migration_support/schema_migration.rb