Static analysis improvements

[morozov]

Q	A
Type	improvement
BC Break	no

During merging up #4319 to master (currently only prepared locally), some new Psalm and PHPStan failures occurred. Instead of just fixing them in the merge commit, I'd like to fix them in the earliest possible version.

1. Psalm flags (array) casting in ReservedWordsCommand as a type error because getOption() may return a boolean which will be cast to [false] or [true] neither of which is a valid list of platforms:

   dbal/lib/Doctrine/DBAL/Tools/Console/Command/ReservedWordsCommand.php

   Line 152 in e7c4149

   $keywordLists = (array) $input->getOption('list');

2. SchemaManagerFunctionalTestCase has really creepy magic that requires an assertion for PHPStan but Psalm considers this assertion redundant:

   dbal/tests/Functional/Schema/SchemaManagerFunctionalTestCase.php

   Lines 54 to 62 in 4eba1ba

   	protected function getPlatformName(): string
   	{
   	$class = static::class;
   	$e = explode('\\', $class);
   	$testClass = end($e);
   	assert(is_string($testClass));
   	return strtolower(str_replace('SchemaManagerTest', '', $testClass));
   	}

   
   Due to this magic, the test must be named exactly like the platform it's supposed to test or otherwise, it will be skipped. It's better to implement the logic of which test tests which platform explicitly.
3. The type of the prepared statement parameter type argument is specified inconsistently across the codebase. The valid type of the type is int|string|Type|null which is one of the ParameterType constants, DBAL type name, DBAL type object, or NULL respectively.
4. The $identifier argument in Connection::update() and ::delete() methods have been renamed to $criteria which it actually is. Otherwise, an "identifier" implies that a single record will be identified.