Export renderers from pyinstrument.renderers

Type checkers don't like it when you use symbols that are not exported in that module. Putting the renderers in `__all__` will export them here so imports like this one pass mypy:

from pyinstrument.renderers import HTMLRenderer

Currently one must specify the specific module that owns the renderer to import it.

from pyinstrument.renderers.html import HTMLRenderer

pyinstrument/renderers/__init__.py

@@ -5,3 +5,14 @@
 from pyinstrument.renderers.pstatsrenderer import PstatsRenderer
 from pyinstrument.renderers.session import SessionRenderer
 from pyinstrument.renderers.speedscope import SpeedscopeRenderer
+
+__all__ = [
+    "ConsoleRenderer",
+    "FrameRenderer",
+    "HTMLRenderer",
+    "JSONRenderer",
+    "PstatsRenderer",
+    "Renderer",
+    "SessionRenderer",
+    "SpeedscopeRenderer",
+]