ruff: T6583: Added settings for ruff

Ruff settings help to write code in the same style for all contributors. These
settings are compatible with requirements used in another very (if not the most)
popular code formatter - black, except using a single quote, to keep the style
also compatible with what we have now.

ruff.toml

@@ -0,0 +1,18 @@
+# Same as Black.
+line-length = 88
+indent-width = 4
+
+# Assume Python 3.11
+target-version = "py311"
+
+[format]
+quote-style = "single"
+
+# Like Black, indent with spaces, rather than tabs.
+indent-style = "space"
+
+# Like Black, respect magic trailing commas.
+skip-magic-trailing-comma = false
+
+# Like Black, automatically detect the appropriate line ending.
+line-ending = "auto"