Unify router API

[Yeseh]

Currently, users need to use two separate classes to instantiate routers for different database types. The API could be more made more unified and straightforward by creating a single entry point.

For example:

import {induct} from "@inductjs/core";

// Instantiate with new factory function
const inductRouter = induct({
     db: knex,  // auto detect mongo or knex connection object to return correct Induct class
     schema: UserSchema,
     tableName: "dbo.users", // make tableName required for sql instances
     idField: "uuid",  //  extend possible id fields with "_id" for mongo instances
})

const router = inductRouter.default()  // returns express router with default routes

// add other 
router.get("/extra", someOtherHandler)

export default router;