script_bindings(python): Add ruff rule for strict typing in function (#38694)

This is part of introducing the Ruff rule [flake8-annotations
(ANN)](https://docs.astral.sh/ruff/rules/#flake8-annotations-ann) into
the script_bindings folder.

Since `codegen.py` has 10k lines of code, the strategy is to introduce
the rule first while ignoring the `ANN` Ruff rule for `codegen.py`. We
will then gradually add type annotations slice by slice to ensure no new
errors occur outside of `ANN`.

Testing: `./mach test-wpt webidl`

---------

Signed-off-by: Jerens Lensun <jerensslensun@gmail.com>

components/script_bindings/codegen/run.py

@@ -2,16 +2,25 @@
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at https://mozilla.org/MPL/2.0/.
 
+# fmt: off
+
+from __future__ import annotations
+
 import os
 import sys
 import json
 import re
+from typing import TYPE_CHECKING
+from collections.abc import Iterator
 
 SCRIPT_PATH = os.path.abspath(os.path.dirname(__file__))
 SERVO_ROOT = os.path.abspath(os.path.join(SCRIPT_PATH, "..", "..", ".."))
 
 FILTER_PATTERN = re.compile("// skip-unless ([A-Z_]+)\n")
 
+if TYPE_CHECKING:
+    from configuration import Configuration
+    from WebIDL import Parser
 
 def main() -> None:
     os.chdir(os.path.join(os.path.dirname(__file__)))
@@ -84,13 +93,13 @@ def main() -> None:
                 f.write(module.encode("utf-8"))
 
 
-def make_dir(path: str):
+def make_dir(path: str)-> str:
     if not os.path.exists(path):
         os.makedirs(path)
     return path
 
 
-def generate(config, name: str, filename: str) -> None:
+def generate(config: Configuration, name: str, filename: str) -> None:
     from codegen import GlobalGenRoots
     root = getattr(GlobalGenRoots, name)(config)
     code = root.define()
@@ -98,7 +107,7 @@ def generate(config, name: str, filename: str) -> None:
         f.write(code.encode("utf-8"))
 
 
-def add_css_properties_attributes(css_properties_json: str, parser) -> None:
+def add_css_properties_attributes(css_properties_json: str, parser: Parser) -> None:
     def map_preference_name(preference_name: str) -> str:
         """Map between Stylo preference names and Servo preference names as the
         `css-properties.json` file is generated by Stylo. This should be kept in sync with the
@@ -132,7 +141,7 @@ def add_css_properties_attributes(css_properties_json: str, parser) -> None:
     parser.parse(idl, "CSSStyleDeclaration_generated.webidl")
 
 
-def attribute_names(property_name: str):
+def attribute_names(property_name: str) -> Iterator[str]:
     # https://drafts.csswg.org/cssom/#dom-cssstyledeclaration-dashed-attribute
     if property_name != "float":
         yield property_name
@@ -149,7 +158,7 @@ def attribute_names(property_name: str):
 
 
 # https://drafts.csswg.org/cssom/#css-property-to-idl-attribute
-def camel_case(chars: str, webkit_prefixed: bool = False):
+def camel_case(chars: str, webkit_prefixed: bool = False) -> Iterator[str]:
     if webkit_prefixed:
         chars = chars[1:]
     next_is_uppercase = False