Implement E241 and E242 (tab/multiple ws after commas) (#6094)

## Summary

This PR implements pycodestyle's E241 (tab after comma) and E242
(multiple whitespace after comma) lints.

These are marked as nursery rules like many other pycodestyle rules.

Refs #2402

## Test Plan

E24.py copied from pycodestyle.

scripts/check_docs_formatted.py

@@ -43,6 +43,7 @@ KNOWN_FORMATTING_VIOLATIONS = [
     "missing-whitespace-around-operator",
     "multi-line-implicit-string-concatenation",
     "multiple-leading-hashes-for-block-comment",
+    "multiple-spaces-after-comma",
     "multiple-spaces-after-keyword",
     "multiple-spaces-after-operator",
     "multiple-spaces-before-keyword",
@@ -81,6 +82,7 @@ KNOWN_PARSE_ERRORS = [
     "missing-newline-at-end-of-file",
     "mixed-spaces-and-tabs",
     "no-indented-block",
+    "tab-after-comma",
     "tab-after-keyword",
     "tab-after-operator",
     "tab-before-keyword",