Enable black + isort fbsource linter

Summary:
Enable `black` + `isort` (via `pyfmt`) i.e. `BLACK` fbsource linter.

NOTE: the `BLACK` fbsource linter (and `black` itself) is (by design) ***not*** configurable. This forces aligning the existing options used by the tools invoked in `dev/linter.sh` (for 3rd party developers) with `BLACK` fbsource linting. Without this reconciliation, the different linters (used internally or by 3rd party developers) would simply conflict with each other resulting in artificial back-and-forth changes (for instance line width which `BLACK` forces to 88 characters).

Reviewed By: nikhilaravi

Differential Revision: D20558374

fbshipit-source-id: 614fa00664f8eb9d2de7438c29b807dfbf36ad20

.flake8

 [flake8]
 ignore = E203, E266, E501, W503, E221
-max-line-length = 80
+max-line-length = 88
 max-complexity = 18
 select = B,C,E,F,W,T4,B9
 exclude = build,__init__.py

dev/linter.sh

@@ -19,7 +19,7 @@ echo "Running isort..."
 isort -y -sp "${DIR}"
 
 echo "Running black..."
-black -l 80 "${DIR}"
+black "${DIR}"
 
 echo "Running flake..."
 flake8 "${DIR}"

setup.cfg

 # Copyright (c) Facebook, Inc. and its affiliates. All rights reserved.
 
 [isort]
-line_length=80
-include_trailing_comma=True
-multi_line_output=3
-known_standard_library=numpy,setuptools
-known_myself=pytorch3d
-known_third_party=fvcore,torch,torchvision,matplotlib,mpl_toolkits,PIL,yaml
-                  jinja2,requests,nbformat,nbconvert,bs4
-no_lines_before=STDLIB,THIRDPARTY
-sections=FUTURE,STDLIB,THIRDPARTY,myself,FIRSTPARTY,LOCALFOLDER
-default_section=FIRSTPARTY
+line_length = 88
+multi_line_output = 3
+include_trailing_comma = True
+force_grid_warp = 0
+default_section = THIRDPARTY
+lines_after_imports = 2
+combine_as_imports = True