[6.x] Add fluent plugin configuration

[riasvdv]

Description

Adds support for fluent plugin configuration by letting Plugins define methods on their PluginSettings class:

class MyPluginSettings extends PluginSettings
{
    public bool $enabled = false;

    public ?string $title = 'Default';
   
    public function title(?string $value): static
    {
        $this->title = $title;

        return $this;
    }

    public function enabled(bool $enabled = true): static
    {
        $this->enabled = $enabled;

         return $this;
    }
}

Which can then by used in the config file:

// config/craft/my-plugin.php

return MyPlugin::config()
    ->enabled()
    ->title('Some title');

Caution

This is a breaking change within the 6.x alpha. createSettingsModel() has been replace by a static createSettings() method which must now return an instance of PluginSettings and not just Validatable

[linear-code]

CMS-1003

[github-actions]

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