Fix model.populate() typescript return type to support paths

[meness]

Prerequisites

• I have written a descriptive issue title
• I have searched existing issues to ensure the feature has not already been requested

🚀 Feature Proposal

Model

/** Populates document references. */
populate(docs: Array<any>, options: PopulateOptions | Array<PopulateOptions> | string,
      callback?: Callback<(HydratedDocument<T, TMethodsAndOverrides, TVirtuals>)[]>): Promise<Array<HydratedDocument<T, TMethodsAndOverrides, TVirtuals>>>;

populate(doc: any, options: PopulateOptions | Array<PopulateOptions> | string,
      callback?: Callback<HydratedDocument<T, TMethodsAndOverrides, TVirtuals>>): Promise<HydratedDocument<T, TMethodsAndOverrides, TVirtuals>>;

Query

/** Specifies paths which should be populated with other documents. */
populate<Paths = {}>(path: string | string[], select?: string | any, model?: string | Model<any, THelpers>, match?: any): QueryWithHelpers<UnpackedIntersection<ResultType, Paths>, DocType, THelpers, UnpackedIntersection<RawDocType, Paths>>;

populate<Paths = {}>(options: PopulateOptions | (PopulateOptions | string)[]): QueryWithHelpers<UnpackedIntersection<ResultType, Paths>, DocType, THelpers, UnpackedIntersection<RawDocType, Paths>>;

query.populate() is what I need that applies paths. I use model.populate() because I have to use aggregate(). aggregate() receives a type, maybe you can use the return type instead of any.

Motivation

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Example

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