Add initial PHPStan config

[swissspidy]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 78.31325% with 36 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
src/Profiler.php	65.16%	31 Missing ⚠️
src/Formatter.php	85.29%	5 Missing ⚠️

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[gemini-code-assist]

Code Review

This pull request introduces PHPStan for static analysis by adding a configuration file and a scan file. The majority of the changes involve adding comprehensive PHPDoc annotations to properties and methods across the codebase to improve type safety and documentation. Additionally, the Profiler class was refactored to use more specific variable names for loggers, preventing potential issues with undefined variables. Feedback was provided regarding a minor efficiency improvement in the float comparison logic within the Formatter class.

[gemini-code-assist]

The subtraction $a - $b is performed multiple times. It is more efficient to calculate the difference once and reuse it.

		$diff = $a - $b;
		if ( 0.0 === $diff ) {
			return 0;
		} elseif ( $diff < 0 ) {
			return -1;