Console exporter for OTAP/OTLP logs (#1849)

Part of #1771.

Part of #1736.

Uses the new internal logging support to format OTLP logs data. This
prints RESOURCE and SCOPE lines with ASCII or Unicode pipe structures to
identify the OTLP hierarchy:

```
2026-01-21T03:12:22.165Z  RESOURCE   v1.Resource: [fake_data_generator=v1]
2026-01-21T03:12:22.165Z  │ SCOPE    v1.InstrumentationScope:
2026-01-21T03:12:22.165Z  │ ├─ INFO  session.start:  [session.id=00112233-4455-6677-8899-aabbccddeeff, session.previous_id=00112233-4455-6677-8899-aabbccddeeff]
2026-01-21T03:12:22.165Z  │ ├─ INFO  session.end:  [session.id=00112233-4455-6677-8899-aabbccddeeff]
2026-01-21T03:12:22.165Z  │ ├─ INFO  device.app.lifecycle:  [ios.app.state=active, android.app.state=created]
2026-01-21T03:12:22.165Z  │ ├─ INFO  rpc.message:  [rpc.message.type=SENT, rpc.message.id=42, rpc.message.compressed_size=42, rpc.message.uncompressed_size=42]
```

---------

Co-authored-by: Utkarsh Umesan Pillai <66651184+utpilla@users.noreply.github.com>

Author: jmacd

rust/otap-dataflow/configs/fake-batch-console.yaml

@@ -0,0 +1,40 @@
+# Shows the batch processor.
+settings:
+  default_pipeline_ctrl_msg_channel_size: 100
+  default_node_ctrl_msg_channel_size: 100
+  default_pdata_channel_size: 100
+
+nodes:
+  receiver:
+    kind: receiver
+    plugin_urn: "urn:otel:otap:fake_data_generator:receiver"
+    out_ports:
+      out_port:
+        destinations:
+          - batch
+        dispatch_strategy: round_robin
+    config:
+      traffic_config:
+        max_signal_count: 10000
+        max_batch_size: 100
+        signals_per_second: 100
+        log_weight: 100
+      registry_path: https://github.com/open-telemetry/semantic-conventions.git[model]
+  batch:
+    kind: processor
+    plugin_urn: "urn:otel:batch:processor"
+    out_ports:
+      out_port:
+        destinations:
+          - console
+        dispatch_strategy: round_robin
+    config:
+      otap:
+        min_size: 1000
+        sizer: items
+      format: otap
+      flush_timeout: 3s
+  console:
+    kind: exporter
+    plugin_urn: "urn:otel:console:exporter"
+    config: {}