task callsites: part 2 (#4188)

* add struct logging to docs serve

* remove merge fluff

* struct logging to seed command

* converting print to use structured logging

* more structured logging print conversion

* pulling apart formatting more

* added struct logging by disecting printer.py

* add struct logging to runnable

* add struct logging to task init

* fixed formatting

* more formatting and moving things around

automatic commit by git-black, original commits:
  3cafc9e
  9cc7a7a

core/dbt/task/serve.py

@@ -28,8 +28,7 @@ def run(self):
 
         # mypy doesn't think SimpleHTTPRequestHandler is ok here, but it is
         httpd = TCPServer(  # type: ignore
-            (address, port),
-            SimpleHTTPRequestHandler  # type: ignore
+            (address, port), SimpleHTTPRequestHandler  # type: ignore
         )  # type: ignore
 
         if self.args.open_browser: