Feature/agent manager (#146)

* Agent schema
* Agent working through client
* Add agent-manager-react command line
* test-agent test script
* Add tg-invoke-agent CLI

tests/test-agent

@@ -0,0 +1,44 @@
+#!/usr/bin/env python3
+
+import json
+import textwrap
+from trustgraph.clients.agent_client import AgentClient
+
+def wrap(text, width=75):
+
+    if text is None: text = "n/a"
+
+    out = textwrap.wrap(
+        text, width=width
+    )
+    return "\n".join(out)
+
+def output(text, prefix="> ", width=78):
+
+    out = textwrap.indent(
+        text, prefix=prefix
+    )
+    print(out)
+
+p = AgentClient(pulsar_host="pulsar://localhost:6650")
+
+q = "How many cats does Mark have? Calculate that number raised to 0.4 power.  Is that number lower than the numeric part of the mission identifier of the Space Shuttle Challenger on its last mission?  If so, give me an apple pie recipe, otherwise return a poem about cheese."
+
+output(wrap(q), "\U00002753 ")
+print()
+
+def think(x):
+    output(wrap(x), "\U0001f914 ")
+    print()
+
+def observe(x):
+    output(wrap(x), "\U0001f4a1 ")
+    print()
+
+resp = p.request(
+    question=q, think=think, observe=observe,
+)
+
+output(resp, "\U0001f4ac ")
+print()
+