Fixed options object typings for javascript plugins inside plugin.d.ts

[arv-asommer]

Solves this issue: #1

[BrocksiNet]

any is bad; could it also be an object?

or even better a proper type defined.

[arv-asommer]

But you have to use any here since you also want the user to use their own types here...
Another way might be to put a generic onto the Plugin class itself. Then it might be used like this:

export default class CustomStorefrontPlugin extends Plugin<{ option1: string; option2: CustomType | null }> {
  static options = {
    option1 = 'Default string value',
    option2 = null
},

  init() {...}