Allow SPARQL queries to accept query arguments

[claudiu-cristea]

Implement argument replacement for:

• \Drupal\rdf_entity\Database\Driver\sparql\Connection::query()
• \Drupal\rdf_entity\Database\Driver\sparql\Connection::update()

This is not easy as the core drivers are deferring this operation to \PDOStatement::execute() but PDO doesn't have any API that exposes the compiled query. We need to build a routine to perform the arguments SANITIZATION and REPLACEMENT.

Hints:

• Search for a library/code snippet that is doing the sanitization and mimics PDO
• Research in the source code of PDO and replicate in PHP the same process.

[claudiu-cristea]

Closing in favour of ec-europa/sparql_entity_storage#1