kdeldycke/click-extra: v7.8.0

[!NOTE] 7.8.0 is available on 🐍 PyPI and 🐙 GitHub. Add config_schema parameter to ConfigOption and ExtraCommand/ExtraGroup for typed configuration access via dataclasses or custom callables. Add fallback_sections parameter for legacy configuration section name migration with deprecation warnings. Add normalize_config_keys() utility to convert kebab-case config keys to snake_case Python identifiers. Add get_tool_config() helper to retrieve typed configuration from context. Check more variations of local, stable and dev CLI invocations. Adopt RUF022 rule to let ruff enforce __all__ sorting. Fix ruff 0.15.5 lint errors. Full changelog: v7.7.0...v7.8.0