Enforce ruff/pycodestyle warnings (W) (zarr-developers#2369)

* Apply ruff/pycodestyle rule W291

W291 Trailing whitespace

* Enforce ruff/pycodestyle warnings (W)

It looks like `ruff format` does not catch all trailing spaces.

---------

Co-authored-by: Joe Hamman <[email protected]>

Author: DimitriPapadopoulos

pyproject.toml

@@ -223,6 +223,7 @@ extend-select = [
     "TCH", # flake8-type-checking
     "TRY", # tryceratops
     "UP",  # pyupgrade
+    "W",   # pycodestyle warnings
 ]
 ignore = [
     "ANN003",

src/zarr/registry.py

@@ -48,9 +48,9 @@ def register(self, cls: type[T]) -> None:
 __ndbuffer_registry: Registry[NDBuffer] = Registry()
 
 """
-The registry module is responsible for managing implementations of codecs, pipelines, buffers and ndbuffers and 
-collecting them from entrypoints.
-The implementation used is determined by the config
+The registry module is responsible for managing implementations of codecs,
+pipelines, buffers and ndbuffers and collecting them from entrypoints.
+The implementation used is determined by the config.
 """