Support adding query-parameters in RestClient Requests.

[hamzahejja]

Description: Per Issue #172 reported, this PR will allow sending query-parameters with RestClient GET Requests.

Introduced Changes:

• Introduced a new common interface IRequestQueryParams, which can be globally used by any contributors willing to benefit from it OR build upon it after this contribution.

  interface IRequestQueryParams {
  options?: {
      separator?: string,
      arrayFormat?: string,
      shouldAllowDots?: boolean
      shouldOnlyEncodeValues?: boolean,
  },
  params: {
      [name: string]: string | number | (string | number)[]
  }
  }

• function getUrl of Util.ts to receive optional query parameters object, to use while building the request's URL: getUrl(resource: string, baseUrl?: string, queryParams?: IRequestQueryParams).

• Modified the RestClient.ts module so that the IRequestOptions interface now can have optional queryParameters field of IRequestQueryParams type.

• Added integration tests to address the change

• Added unit tests to address changes

[msftclas]

All CLA requirements met.

[damccorm]

This looks awesome, thanks for the contribution @hamzahejja!