Add `StringUtil::joinNonEmpty()` #52

Job	Run time
Code Coverage	18s
Mutation Tests	24s
Normalize composer.json	12s
Validate composer dependencies	7s
Fix PHP codestyle with php-cs-fixer	18s
Static Code Analysis	19s
Tests - PHP 7.4, Illuminate ^8.73, lowest	11s
Tests - PHP 7.4, Illuminate ^8.73, highest	12s
Tests - PHP 8.0, Illuminate ^8.73, lowest	20s
Tests - PHP 8.0, Illuminate ^9, lowest	12s
Tests - PHP 8.0, Illuminate ^8.73, highest	12s
Tests - PHP 8.0, Illuminate ^9, highest	15s
Tests - PHP 8.1, Illuminate ^8.73, lowest	14s
Tests - PHP 8.1, Illuminate ^9, lowest	13s
Tests - PHP 8.1, Illuminate ^10, lowest	16s
Tests - PHP 8.1, Illuminate ^8.73, highest	11s
Tests - PHP 8.1, Illuminate ^9, highest	11s
Tests - PHP 8.1, Illuminate ^10, highest	10s
Tests - PHP 8.2, Illuminate ^8.73, lowest	12s
Tests - PHP 8.2, Illuminate ^9, lowest	11s
Tests - PHP 8.2, Illuminate ^10, lowest	12s
Tests - PHP 8.2, Illuminate ^8.73, highest	10s
Tests - PHP 8.2, Illuminate ^9, highest	14s
Tests - PHP 8.2, Illuminate ^10, highest	17s
	5m 31s

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