IBX-6824: Fixed doctrine metadata property/foreign key relationship methods

[Steveb-p]

Question	Answer
JIRA issue	IBX-6824
Type	bug
Target Ibexa version	v4.6
BC breaks	no

Despite the name

public function getRelationshipByForeignColumn(string $foreignProperty): DoctrineRelationshipInterface;

method was working with foreign key column in it's actual implementation. This PR remedies that, making the method properly return based on foreign column.

Additionally:

• a proper

public function getRelationshipByForeignProperty(string $foreignProperty): DoctrineRelationshipInterface;

is introduced.

• MappingExceptionInterface and RuntimeMappingExceptionInterface are introduced. The former is responsible for any errors that happen when schema metadata is declared (column collisions primarily). The latter can be thrown if non-existent columns are being accessed and similar.
• Relation-related tests are added to ExpressionVisitor

Checklist:

• Provided PR description.
• Tested the solution manually.
• Provided automated test coverage.
• Checked that target branch is set correctly (main for features, the oldest supported for bugs).
• Ran PHP CS Fixer for new PHP code (use $ composer fix-cs).
• Asked for a review (ping for example @ibexa/php-dev for back-end changes and/or @ibexa/javascript-dev for
  front-end changes).