[TypeDeclarations] Add IncreaseDeclareStrictTypesRector to raise level of declare() coverage

[TomasVotruba]

This rule helps with increasing strict declares in your code, in the amount you define per run.

use Rector\TypeDeclaration\Rector\StmtsAwareInterface\IncreaseDeclareStrictTypesRector;

return RectorConfig::configure()
    ->withConfiguredRule(IncreaseDeclareStrictTypesRector::class, [
        'limit' => 10,
    ]);

This configuration will add declare(strict_types=1) to 10 new files per Rector run. Then CI will report feedback and show, if files need type fixes.

The idea is to improve code coverage in gradual, safe and steady way, as any type change could be very sensistive.
See https://tomasvotruba.com/blog/master-the-change for more

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Use only manually with combination of cusotm PHPStan rule 🙂
TomasVotruba/type-coverage#35