Make Collections a service that devs can extend

[webrgp]

Collections in Craft is great, but I wish it was implemented as a service so I could extend and allow devs to add macros to it. Everywhere Craft invokes either Collection::make or ElementCollection::make should be coming from this service, so added macros would be available everywhere.

[brandonkelly]

Plugins can add new macros to collections using Illuminate\Support\Collection::macro(), as we are doing here:

cms/src/base/ApplicationTrait.php

Lines 1558 to 1575 in 6593979

	// Register Collection::set() as an alias of put() - with support for bulk-setting values
	Collection::macro('set', function(mixed $values) {
	/** @var Collection $this */
	if (is_array($values)) {
	foreach ($values as $key => $value) {
	$this->put($key, $value);
	}
	} else {
	$this->put(...func_get_args());
	}
	return $this;
	});
	// Register Collection::one() as an alias of first(), for consistency with yii\db\Query.
	Collection::macro('one', function() {
	/** @var Collection $this */
	return $this->first(...func_get_args());
	});

[webrgp]

Awesome, thanks!