feat(modules-sdk): Module provider plugin loader

[olivermrbl]

What

Allow plugins to be installed in a module:

modules: {
    ...
    payment: {
      resolve: "@medusajs/payment",
      options: {
        providers: [
          {
            name: "@medusajs/payment-stripe",
            options: { ... },
          },
          {
            name: "@medusajs/payment-klarna",
            options: { ... },
          },
        ]
      }
    },
  },

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[riqwan]

clean!

[carlos-r-l-rodrigues]

LGTM

just a small comment

[fPolic]

LGTM 💪

[adrien2p]

LGTM 💪 small suggestions and todo

[srindom]

@olivermrbl - is this ready to merge?

[olivermrbl]

@olivermrbl - is this ready to merge?

Yes, I will work on the changes for provider plugins in a follow-up PR.

I.e. the changes needed in the Payment Module to load multiple provider installations like so:

/**
 * Example: Payment provider installation
 * {
 *  resolve: "@medusajs/payment-stripe",
 *  options: {
 *    providers: {
 *     dkk: { ...credentials }
 *     usd: { ...credentials }
 *   }
 *  }
 * }
 *
 * The installation above will install the Stripe payment provider plugin.
 * The plugin is installed with two sets of credentials, one for a DKK Stripe account and one for a USD Stripe account.
 */

This will not touch the general module provider loading mechanism but instead be specific to modules. This is where the registrationFn will come in handy.