add url module

[gibkigonzo]

Close: vuestorefront/vue-storefront#3942

Description:
This module search for record in multiple entities based on url value.

Config:

"includeFields": ["url_path", "identifier", "id", "slug", "sku", "type_id"],

// Here we can define base fields that we want to fetch if there is record in ES.
// Those fields are needed to build proper url object on frontend side.
// But you can also send in body fields that you want.
// Example: {"url": "about-us", "includeFields": ["content"]}

"searchedFields": ["url_path", "identifier"],
// Here we can define which field value equals to url value.
// By default we search "url_path" for product/category and "identifier" for cms_page

"searchedEntities": ["product", "category", "cms_page"]
// Here we have list of searched entities