Cache breaks in 0.12 #56

Package version
^0.12 (it works with 0.11)

Describe the bug
Caching does not work anymore. It fails with the following error:

InvalidArgumentException: Either provide cache key manually or use instance of League\OpenAPIValidation\PSR7\CacheableSchemaFactory

I'm using this code in a Laravel application

ValidatorBuilder::fromYamlFile(
  base_path($attribute->path)
)->setCache(Cache::store('array'));

I believe the issue is caused by these two lines v0.11...v0.12#diff-1f85b5959abc5be7145c8b5b7b5b6ac6890e8c2e3b7d4184052cf7b65d249136R113-R114.

In 0.11 the implementation of the ValidatorBuilder factory is an instance of YamlFileFactory, which implements the CacheableSchemaFactory. However in 0.12 the implementation is a PrecreatedSchemaFactory, which obviously doesn't implement the CacheableSchemaFactory.

To Reproduce
Steps to reproduce the behaviour:

1. It should happen with any basic implementation (fromYamlFile, fromJsonFile), as long as it uses the cache.

Expected behaviour
The cache should not fail.

Additional context
The League\OpenAPIValidation\PSR7\ValidatorBuilder class has a overrideCacheKey method that could be used to fix this problem.