Add factories for `@template-extends` and `@template-implements`

[mspirkov]

Currently, StandardTagFactory cannot create TemplateImplements and TemplateExtends because there are no factories for them.

ReflectionDocBlock/src/DocBlock/StandardTagFactory.php

Lines 169 to 170 in 2f5cbed

	$tagFactory->registerTagHandler('template-extends', $phpstanTagFactory);
	$tagFactory->registerTagHandler('template-implements', $phpstanTagFactory);

ReflectionDocBlock/tests/unit/DocBlock/StandardTagFactoryTest.php

Lines 594 to 596 in 2f5cbed

	// TODO: add factories for this tags
	// ['@template-extends Foo', TemplateExtends::class],
	// ['@template-implements Foo', TemplateImplements::class],