Metapackages for provider

[hobbypunk90]

Hello,

I think it would be very helpful if you provide metapackages, for an easier integration and version management of pay.
Instead of

gem "pay", "~> 6.0"

# To use Stripe, also include:
gem "stripe", "~> 8.0"

# To use Braintree + PayPal, also include:
gem "braintree", "~> 4.7"

# To use Paddle, also include:
gem "paddle_pay", "~> 0.2"

# To use Receipts gem for creating invoice and receipt PDFs, also include:
gem "receipts", "~> 2.0"

it could look like this

gem "pay", "~> 6.0"

# To use Stripe, also include:
gem "pay-stripe", "~> 6.0"

# To use Braintree + PayPal, also include:
gem "pay-braintree", "~> 6.0"

# To use Paddle, also include:
gem "pay-paddle_pay", "~> 6.0"

# To use Receipts gem for creating invoice and receipt PDFs, also include:
gem "pay-receipts", "~> 6.0"

the big advantage of this approach is that you automatical updates the stripe and others versions for the user of pay and we can use our update managers without worries 😁

Greets
Marcel