misc: Identify first party modules for isort

List known first party modules in `isort` configuration, to ensure
proper sorting of imports.

First commit includes configuration changes, while second commit runs
`trunk` with the new configuration.

.trunk/configs/.isort.cfg

@@ -1,2 +1,13 @@
 [settings]
 profile=black
+known_first_party =
+  adapters
+  config
+  decorators
+  endpoints
+  exceptions
+  handler
+  logger
+  models
+  tasks
+  utils