* test: add integration tests for kafka wal
* chore: rebase main
* chore: unify naming convention for wal config
* chore: add register loaders switch
* chore: alter tables by adding a new column
* chore: move rand to dev-dependencies
* chore: update Cargo.lock
* fix: logical region can't find region routes
* feat: fetch partitions info in batch
* refactor: rename batch functions
* refactor: rename DdlTaskExecutor to ProcedureExecutor
* feat: impl migrate_region and query_procedure_state for ProcedureExecutor
* feat: adds SQL function procedure_state and finish migrate_region impl
* fix: constant vector
* feat: unit tests for migrate_region and procedure_state
* test: test region migration by SQL
* fix: compile error after rebeasing
* fix: clippy warnings
* feat: ensure procedure_state and migrate_region can be only called under greptime catalog
* fix: license header
* fix: fix heartbeat handler ignore upgrade candidate instruction
* fix: fix handler did not inject wal options
* feat: expose `RegionMigrationProcedureTask`
* feat(tests-integration): add a naive region migration test
* chore: apply suggestions from CR
* feat: add test if the target region has migrated
* chore: apply suggestions from CR