Add ufmt (usort + black) as code formatter (#4384)

* add ufmt as code formatter

* cleanup

* quote ufmt requirement

* split imports into more groups

* regenerate circleci config

* fix CI

* clarify local testing utils section

* use ufmt pre-commit hook

* split relative imports into local category

* Revert "split relative imports into local category"

This reverts commit f2e224c.

* pin black and usort dependencies

* fix local test utils detection

* fix ufmt rev

* add reference utils to local category

* fix usort config

* remove custom categories sorting

* Run pre-commit without fixing flake8

* got a double import in merge

Co-authored-by: Nicolas Hug <[email protected]>

Author: pmeier

.circleci/config.yml

@@ -201,7 +201,7 @@ jobs:
             pip install --user --progress-bar off types-requests
             pip install --user --progress-bar off --pre torch -f https://download.pytorch.org/whl/nightly/cpu/torch_nightly.html
             pip install --user --progress-bar off git+https://github.com/pytorch/data.git
-            pip install --user --progress-bar off --editable .
+            pip install --user --progress-bar off --no-build-isolation --editable .
             mypy --config-file mypy.ini
 
   docstring_parameters_sync:
@@ -235,7 +235,7 @@ jobs:
           command: |
             pip install --user --progress-bar off --pre torch -f https://download.pytorch.org/whl/nightly/cpu/torch_nightly.html
             # need to install torchvision dependencies due to transitive imports
-            pip install --user --progress-bar off .
+            pip install --user --progress-bar off --no-build-isolation .
             pip install pytest
             python test/test_hub.py
 
@@ -248,7 +248,7 @@ jobs:
           command: |
             pip install --user --progress-bar off --pre torch -f https://download.pytorch.org/whl/nightly/cpu/torch_nightly.html
             # need to install torchvision dependencies due to transitive imports
-            pip install --user --progress-bar off .
+            pip install --user --progress-bar off --no-build-isolation .
             pip install --user onnx
             pip install --user onnxruntime
             pip install --user pytest