[pycodestyle]: Make blank lines in typing stub files optional (E3*)

[MichaReiser]

Summary

Fixes #10039

The recommendation for typing stub files is to use one blank line to group related definitions and
otherwise omit blank lines.

The newly added blank line rules (E3*) didn't account for typing stub files and enforced two empty lines at the top level and one empty line otherwise, making it impossible to group related definitions.

This PR implements the E3* rules to:

• Not enforce blank lines. The use of blank lines in typing definitions is entirely up to the user.
• Allow at most one empty line, including between top level statements.

Test Plan

Added unit tests (It may look odd that many snapshots are empty but the point is that the rule should no longer emit diagnostics)

[github-actions]

ruff-ecosystem results

Linter (stable)

✅ ecosystem check detected no linter changes.

Linter (preview)

ℹ️ ecosystem check detected linter changes. (+57 -138 violations, +0 -0 fixes in 6 projects; 37 projects unchanged)

RasaHQ/rasa (+0 -4 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

- stubs/aio_pika/robust_channel.pyi:10:1: E302 [*] Expected 2 blank lines, found 1
- stubs/sanic.pyi:23:1: E302 [*] Expected 2 blank lines, found 1
- stubs/sanic.pyi:27:1: E302 [*] Expected 2 blank lines, found 1
- stubs/socketio.pyi:49:1: E302 [*] Expected 2 blank lines, found 1

apache/airflow (+0 -25 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview --select ALL

- airflow/compat/functools.pyi:27:1: E302 [*] Expected 2 blank lines, found 1
- airflow/decorators/__init__.pyi:102:5: E301 [*] Expected 1 blank line, found 0
- airflow/decorators/__init__.pyi:105:5: E301 [*] Expected 1 blank line, found 0
- airflow/decorators/__init__.pyi:158:5: E301 [*] Expected 1 blank line, found 0
- airflow/decorators/__init__.pyi:160:5: E301 [*] Expected 1 blank line, found 0
- airflow/decorators/__init__.pyi:191:5: E301 [*] Expected 1 blank line, found 0
- airflow/decorators/__init__.pyi:203:5: E301 [*] Expected 1 blank line, found 0
... 11 additional changes omitted for rule E301
- airflow/decorators/__init__.pyi:63:1: E302 [*] Expected 2 blank lines, found 1
- airflow/decorators/__init__.pyi:723:1: E305 [*] Expected 2 blank lines after class or function definition, found (1)
- airflow/utils/context.pyi:107:1: E302 [*] Expected 2 blank lines, found 1
... 15 additional changes omitted for project

bokeh/bokeh (+0 -53 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview --select ALL

- src/typings/IPython/core/getipython.pyi:3:1: E302 [*] Expected 2 blank lines, found 1
- src/typings/IPython/core/history.pyi:3:1: E302 [*] Expected 2 blank lines, found 1
- src/typings/IPython/core/interactiveshell.pyi:3:1: E302 [*] Expected 2 blank lines, found 1
- src/typings/IPython/display.pyi:3:1: E302 [*] Expected 2 blank lines, found 1
- src/typings/bs4.pyi:12:1: E302 [*] Expected 2 blank lines, found 1
- src/typings/bs4.pyi:15:1: E305 [*] Expected 2 blank lines after class or function definition, found (1)
- src/typings/bs4.pyi:17:1: E302 [*] Expected 2 blank lines, found 1
- src/typings/bs4.pyi:8:1: E302 [*] Expected 2 blank lines, found 1
... 46 additional changes omitted for rule E302
... 45 additional changes omitted for project

freedomofpress/securedrop (+0 -1 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

- redwood/redwood/__init__.pyi:6:1: E302 [*] Expected 2 blank lines, found 1

pandas-dev/pandas (+55 -55 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

- pandas/_libs/algos.pyi:101:5: PLR0917 Too many positional arguments (8/5)
+ pandas/_libs/algos.pyi:108:5: PLR0917 Too many positional arguments (7/5)
- pandas/_libs/algos.pyi:111:5: PLR0917 Too many positional arguments (7/5)
+ pandas/_libs/algos.pyi:15:7: PLW1641 Object does not implement `__hash__` method
- pandas/_libs/algos.pyi:17:7: PLW1641 Object does not implement `__hash__` method
+ pandas/_libs/algos.pyi:7:7: PLW1641 Object does not implement `__hash__` method
- pandas/_libs/algos.pyi:8:7: PLW1641 Object does not implement `__hash__` method
+ pandas/_libs/algos.pyi:98:5: PLR0917 Too many positional arguments (8/5)
- pandas/_libs/groupby.pyi:100:5: PLR0917 Too many positional arguments (8/5)
+ pandas/_libs/groupby.pyi:109:5: PLR0917 Too many positional arguments (7/5)
- pandas/_libs/groupby.pyi:110:5: PLR0917 Too many positional arguments (7/5)
+ pandas/_libs/groupby.pyi:118:5: PLR0917 Too many positional arguments (10/5)
- pandas/_libs/groupby.pyi:119:5: PLR0917 Too many positional arguments (10/5)
+ pandas/_libs/groupby.pyi:130:5: PLR0917 Too many positional arguments (9/5)
... 85 additional changes omitted for rule PLR0917
+ pandas/_libs/interval.pyi:54:1: PLR0904 Too many public methods (29 > 20)
- pandas/_libs/interval.pyi:58:1: PLR0904 Too many public methods (29 > 20)
+ pandas/_libs/tslibs/nattype.pyi:34:1: PLR0904 Too many public methods (63 > 20)
- pandas/_libs/tslibs/nattype.pyi:36:1: PLR0904 Too many public methods (63 > 20)
+ pandas/_libs/tslibs/offsets.pyi:34:1: PLR0904 Too many public methods (35 > 20)
- pandas/_libs/tslibs/offsets.pyi:36:1: PLR0904 Too many public methods (35 > 20)
+ pandas/_libs/tslibs/period.pyi:68:1: PLR0904 Too many public methods (24 > 20)
- pandas/_libs/tslibs/period.pyi:72:1: PLR0904 Too many public methods (24 > 20)
+ pandas/_libs/tslibs/timedeltas.pyi:95:1: PLR0904 Too many public methods (42 > 20)
- pandas/_libs/tslibs/timedeltas.pyi:97:1: PLR0904 Too many public methods (42 > 20)
... 3 additional changes omitted for rule PLR0904
... 86 additional changes omitted for project

rotki/rotki (+2 -0 violations, +0 -0 fixes)

ruff check --no-cache --exit-zero --ignore RUF9 --output-format concise --preview

+ stubs/Crypto/Random/__init__.pyi:11:1: E303 [*] Too many blank lines (2)
+ stubs/Crypto/Random/__init__.pyi:5:1: E303 [*] Too many blank lines (2)

Changes by rule (7 rules affected)

code	total	+ violation	- violation	+ fix	- fix
PLR0917	94	47	47	0	0
E302	65	0	65	0	0
E301	16	0	16	0	0
PLR0904	12	6	6	0	0
PLW1641	4	2	2	0	0
E303	2	2	0	0	0
E305	2	0	2	0	0