Make complexity/configurable/static sets toggleable, drop duplicate naming-rules include

[TomasVotruba]

Problem

Running PHPStan in a project that uses phpstan/extension-installer and also includes config/symplify-rules.neon prints:

This file is included multiple times:
- .../config/naming-rules.neon

naming-rules.neon is auto-loaded by the extension-installer (via extra.phpstan.includes) and gated by the symplify.naming toggle. But symplify-rules.neon includes it a second time, unconditionally - hence the duplicate.

Change

• Drop the redundant naming-rules.neon include from symplify-rules.neon. It stays enabled via the existing symplify.naming: true default and the auto-load.
• Give code-complexity-rules.neon, configurable-rules.neon and static-rules.neon the same conditionalTags treatment as naming-rules.neon, gated by new symplify.complexity, symplify.configurable and symplify.static params (all default true, so no behavior change on upgrade).

Now each set can be turned off from config:

parameters:
    symplify:
        complexity: false
        configurable: false
        static: false

Verification

• Toggle proven for all three registration styles (rules: shorthand, explicit services:, anonymous services with arguments): with the flag true the rule fires, with false it is silent, params resolve with no config errors.
• Full test suite green (371 tests).