Fix Column Typing + SA Check

[AlexandruGG]

This PR:

• Fixes the type hints for Column/Columnable -> this operation supports any "column" key type as parameter, not just int|string. Furthermore, the return type has to be flexible because it will not be T, but rather whatever type was associated with that key, so it has to be mixed
• Has unit tests (phpspec)
• Has static analysis tests (psalm, phpstan)
• Has documentation

Note: I spotted this issue while trying to do this in another project:

/** @return Collection<int, int> */
public function getIds(): Collection 
{
  // ...
  /** @var list<array{id: numeric-string}> $results */
  $results = $qb->getQuery()->getResult();

  return Collection::fromIterable($results)
    ->column('id')
    ->map(static fn (string $id): (int) $id);  
            // -> I got an error here because the map callable was expecting type `array{id: numeric-string}`
}

[drupol]

This depends on #166

[drupol]

All good for me here, merge anytime ! :)

[AlexandruGG]

All good for me here, merge anytime ! :)

Turned on auto-merge 😁

[drupol]

👍