Add types for global instalation

[SkyaTura]

Is your feature request related to a problem? Please describe.
If you install the plugin globally mongoose.plugin(MongoosePaginateV2), TypeScript won't understand that model.paginate is a valid function.

Describe the solution you'd like
Create a global type definition on Model interface to paginate.

  export interface Model<
    TRawDocType,
    TQueryHelpers = NonNullable<unknown>,
    TInstanceMethods = NonNullable<unknown>,
    TVirtuals = NonNullable<unknown>,
    THydratedDocumentType = HydratedDocument<
      TRawDocType,
      TVirtuals & TInstanceMethods,
      TQueryHelpers
    >,
    TSchema = any,
  > extends NodeJS.EventEmitter,
    AcceptsDiscriminator,
    IndexManager,
    SessionStarter {
    paginate<O extends PaginateOptions>(
      query?: FilterQuery<TRawDocType>,
      options?: O,
      callback?: (
        err: any,
        result: PaginateResult<PaginateDocument<TRawDocType, TInstanceMethods, O>>
      ) => void
    ): Promise<PaginateResult<PaginateDocument<TRawDocType, TInstanceMethods, O>>>
    paginate<UserType = TRawDocType, O extends PaginateOptions = PaginateOptions>(
      query?: FilterQuery<TRawDocType>,
      options?: O,
      callback?: (
        err: any,
        result: PaginateResult<PaginateDocument<UserType, TInstanceMethods, O>>
      ) => void
    ): Promise<PaginateResult<PaginateDocument<UserType, TInstanceMethods, O>>>
    paginate<UserType = TRawDocType>(
      query?: FilterQuery<TRawDocType>,
      options?: PaginateOptions,
      callback?: (
        err: any,
        result: PaginateResult<PaginateDocument<UserType, TInstanceMethods, PaginateOptions>>
      ) => void
    ): Promise<PaginateResult<PaginateDocument<UserType, TInstanceMethods, PaginateOptions>>>
  }

There is one catch though, this will type all models even when not using paginate.

Probably there as a nice way to toggle this, but I can't think on one yet.

Describe alternatives you've considered
Copy and paste this code on a .d.ts file on the project.
An alternative and simple solution for that would be include this on the README.

Additional context
That's all.