Auto-load all rule sets, toggle them via symplify.* parameters

[TomasVotruba]

All rule sets are now auto-loaded via phpstan/extension-installer - no includes: needed. Each set is toggled by a parameter:

parameters:
    symplify:
        # enabled by default
        naming: true
        complexity: true
        configurable: true
        static: true
        symfony: true
        symfonyConfig: true
        doctrine: true
        phpunit: true

        # disabled by default
        mocks: false
        ctor: false

• symfony-rules.neon, symfony-config-rules.neon, doctrine-rules.neon and phpunit-rules.neon switched from rules: to conditionalTags with new symfony, symfonyConfig, doctrine, phpunit parameters
• code-complexity, configurable, static, symfony, symfony-config, doctrine and phpunit sets added to extra.phpstan.includes
• rector-rules.neon stays opt-in

Upgrade note: projects that included these sets manually must remove those includes: lines - PHPStan reports the duplicate include with a clear message.