feat: make progressbar a default dep

It's being used in plotting and vispy and is a small enough package to
include as default.

Author: sanjayankur31

setup.cfg

@@ -28,6 +28,7 @@ install_requires =
     libNeuroML>=0.5.5
     matplotlib
     matplotlib-scalebar
+    progressbar2
     graphviz
     typing; python_version<"3.5"
     lxml
@@ -96,7 +97,6 @@ vispy-common =
     scipy
     pyopengl
     PyOpenGL-accelerate
-    progressbar2
 
 vispy-qt5 =
     pyNeuroML[vispy-common]