chore: adhere to ruff's "N" rules (#2377)

* chore: adhere to ruff's "N" rules

WARN: reinstall failing extensions!

bunch of more consistent variable naming. inspired by this issue.
https://github.com/lnbits/lnbits/issues/2308

* fixup! chore: adhere to ruff's "N" rules
* rename to funding_source
* skip jmeter

---------

Co-authored-by: Pavol Rusnak <pavol@rusnak.io>

pyproject.toml

@@ -168,7 +168,8 @@ extend-exclude = [
 # I - isort
 # A - flake8-builtins
 # C - mccabe
-select = ["F", "E", "W", "I", "A", "C"]
+# N - naming
+select = ["F", "E", "W", "I", "A", "C", "N"]
 ignore = []
 
 # Allow autofix for all enabled rules (when `--fix`) is provided.
@@ -178,6 +179,12 @@ unfixable = []
 # Allow unused variables when underscore-prefixed.
 dummy-variable-rgx = "^(_+|(_+[a-zA-Z0-9_]*[a-zA-Z0-9]+?))$"
 
+# needed for pydantic
+[tool.ruff.lint.pep8-naming]
+classmethod-decorators = [
+    "root_validator",
+]
+
 # Ignore unused imports in __init__.py files.
 [tool.ruff.lint.extend-per-file-ignores]
 "__init__.py" = ["F401", "F403"]