Feature: Manually map a webhook to a dispatchable class

[ClaraLeigh]

Description

To allow for different project structures, I wish to allow developers to manually map their webhook to a specific class.

Changes

To be able to use the feature, you need to change the webhooks config array to use an associate array where the key is the $type variable derived from the wehbook url.

For example:

'webhooks' => [
    'orders-create' => [
        'topic' => 'ORDERS_CREATE',
        'address' =>'https://some-app.com/webhook/orders-create',
        'class' => \App\Shopify\Actions\AppUninstalledJob::class
    ]
]

Where $type comes from https://some-app.com/webhook/ orders-create

Notes

• This is backwards compatible, you will never need to name the arrays if you don't need to map classes.
• I feel like this config setting could use improvements in other areas, however I currently have no use-case. For example allowing a custom route might be useful for some devs.
• Also I fixed my username in the contrib list

[Kyon147]

@ClaraLeigh thanks for submitting this PR - it's a fair point to allow more granular control on how the class names for jobs.

Two things can you add:

• The example comment in the config for me too inside this PR. Just so people can see one when the config is copied to their project.
• There's no test hitting your new class check for the webhooks, could you add a new test that just hits that line to make sure we account for it.

Thanks very much!

[ClaraLeigh]

@Kyon147 Those changes should be made now. Let me know if you need anything more for this

[Kyon147]

@ClaraLeigh thanks for updating! Will take a look this week and get it merged in - I'll create a minor release as there is a couple other small fixes in master too.