feat(executions): allow suspending an execution at a breakpoint

- When creating an execution, you can pass a breakpoint of the form `taskId.value` and an execution kind.
- An execution with a breakpoint will be suspended in the `BREAKPOINT` state when arriving at the point where the breakpoint task should be executed
- You can resume an execution from a breakpoint, this would resume the execution and remove the existing breakpoint. At this time a new breakpoint can be passed.
- You can pass a breakpoint when replaying an execution.

Part-of: https://github.com/kestra-io/kestra-ee/issues/1547

jdbc-postgres/src/main/resources/migrations/postgres/V1_39__execution_breakpoint.sql

@@ -0,0 +1 @@
+ALTER TYPE state_type ADD VALUE IF NOT EXISTS 'BREAKPOINT';