style: ruff format and the lint rules of the driver standard

Mechanical: the rule set every NAPALM driver uses (E, F, I, UP, B at line
length 100, Python 3.10), with E501 off under tests/. The code was already
formatted and clean under it; what ruff cannot fix comes in the next commit.

pyproject.toml

@@ -48,7 +48,11 @@ line-length = 100
 target-version = "py310"
 
 [tool.ruff.lint]
-select = ["E", "F", "I", "UP"]
+select = ["E", "F", "I", "UP", "B"]
+
+[tool.ruff.lint.per-file-ignores]
+# Recorded device output keeps its lines.
+"tests/**" = ["E501"]
 
 [tool.mypy]
 python_version = "3.10"