Add ruff rules for Pylint, Refurb, and type hints

[cclauss]

Add ruff rules for datetimes, Pylint, refurb, slots, type hints, and ensure each comment matches the output of the command:
% ruff linter

---

Before:
% ruff check --output-format=concise

examples/django/ds/views.py:49:81: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/django/ds/views.py:60:45: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/django/ds/views.py:64:36: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/django/ds/views.py:109:81: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/django/ds/views.py:116:45: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/django/ds/views.py:120:36: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/django/manage.py:12:9: PLC0415 `import` should be at the top-level of a file
examples/fastapi/app.py:64:76: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/fastapi/app.py:70:41: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/fastapi/app.py:74:32: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/fasthtml/advanced.py:106:30: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/fasthtml/advanced.py:155:34: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/fasthtml/simple.py:38:30: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/fasthtml/simple.py:59:34: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/litestar/app.py:63:63: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/litestar/app.py:69:41: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/litestar/app.py:73:32: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/quart/app.py:67:45: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/quart/app.py:71:36: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/quart/app.py:80:63: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/sanic/app.py:65:68: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/sanic/app.py:89:41: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/sanic/app.py:111:45: DTZ005 `datetime.datetime.now()` called without a `tz` argument
examples/sanic/app.py:120:36: DTZ005 `datetime.datetime.now()` called without a `tz` argument
src/datastar_py/attributes.py:130:23: FURB110 [*] Replace ternary `if` expression with `or` operator
src/datastar_py/attributes.py:136:24: FURB110 [*] Replace ternary `if` expression with `or` operator
src/datastar_py/attributes.py:155:21: FURB110 [*] Replace ternary `if` expression with `or` operator
src/datastar_py/attributes.py:164:23: FURB110 [*] Replace ternary `if` expression with `or` operator
src/datastar_py/attributes.py:219:22: FURB110 [*] Replace ternary `if` expression with `or` operator
src/datastar_py/attributes.py:636:34: PYI041 [*] Use `float` instead of `int | float`
src/datastar_py/sanic.py:46:37: PLR2004 Magic value used in comparison, consider replacing `204` with a constant variable
src/datastar_py/sse.py:8:8: PLR0402 [*] Use `from datastar_py import consts` in lieu of alias
src/datastar_py/sse.py:30:7: SLOT000 Subclasses of `str` should define `__slots__`
src/datastar_py/sse.py:86:9: PLR0913 Too many arguments in function definition (7 > 5)
Found 34 errors.
[*] 7 fixable with the `--fix` option.