Better proc group logging and concurrency (#810)

- Silence pika, cassandra etc. logging at INFO (too much chatter) 
- Add per processor log tags so that logs can be understood in
  processor group.
- Deal with RabbitMQ lag weirdness
- Added more processor group examples

dev-tools/proc-group/groups/llm.yaml

@@ -0,0 +1,24 @@
+# LLM.  Outbound text-completion calls.  Isolated because the upstream
+# LLM API is often the bottleneck and the most likely thing to need
+# restart (provider changes, model changes, API flakiness).
+
+_defaults: &defaults
+  pubsub_backend: rabbitmq
+  rabbitmq_host: localhost
+  log_level: INFO
+
+processors:
+
+  - class: trustgraph.model.text_completion.openai.Processor
+    params:
+      <<: *defaults
+      id: text-completion
+      max_output: 8192
+      temperature: 0.0
+
+  - class: trustgraph.model.text_completion.openai.Processor
+    params:
+      <<: *defaults
+      id: text-completion-rag
+      max_output: 8192
+      temperature: 0.0