[sql] Give the streams that leave a recursive circuit ids of their own - #6852

The compiler assigned the same ids to streams inside the recursive fragment and
the same streams exported outside the fragment:

```rust
let (s6, s9) = circuit.recursive(|circuit, (unused_0, s3)| {
    ...
    let s6 = ...join...;  s6.set_persistent_id(Some("ed5fc63e…"));   // inside the scope
    Ok((s6, s9))
}).unwrap();
s6.set_persistent_id(Some("ed5fc63e…"));                             // exported — same id
```

However these are different streams with different integrals as can be seen
from the circuit:

```
    ┌───────────────────────────────────────────────────────────────┐
    │                                                               │
 i  │               ┌───┐ |-s6 inside the scope                     │
────┼──►δ0─────────►│   │ V    ┌────────┐       ┌───────────────┐   │   ┌───────────┐ s6 exported
    │               │ f ├─────►│distinct├──┬───►│integrate_trace├───┼──►│consolidate├───────►
    │       ┌──────►│   │      └────────┘  │    └───────────────┘   │   └───────────┘
    │       │       └───┘                  │                        │
    │       │                              │                        │
    │       │                              │                        │
    │       │       ┌────┐                 │                        │
    │       └───────┤z^-1│◄────────────────┘                        │
    │               └────┘                                          │
    │                                                               │
    └───────────────────────────────────────────────────────────────┘
```

Suffix the exported stream's id with '.export', in both the single-file and the
multi-crate writer, mirroring the '.delay' suffix that already distinguishes a
recursive input. The checkpoint then holds <id>.shard.accintegral for the inner
trace and <id>.export.shard.accintegral for the outer one.

Bump RECURSIVE_STATE_VERSION with it: the layout of what a recursive view stores
changes, so the ids in the dataflow graph have to change too, or the pipeline
manager would diff the views as unchanged while the runtime finds their state
missing, and refuse to start with UnexpectedBootstrap. The metadata test's
golden ids move for the same reason.

Signed-off-by: Leonid Ryzhyk <leonid@feldera.com>
(cherry picked from commit cce7456)