feat: Add createTypedRouter for building statically typed api router

[jorgenader]

Adding new helper to create statically typed Router.

Took inspiration from @reduxjs/toolkit/query for the builder setup.

Example:

import { createTypedRouter } from '@tg-resources/core';
import { FetchResource } from '@tg-resources/fetch';

interface Animal {
    id: number;
    name: string;
}

const api = createTypedRouter({
    resource: FetchResource,
    config: {
        apiRoot: '/api/v1', // Set api root
    },
    routerBuilder: (builder) => ({
        // types order: Kwargs, FetchResponse, PostPayload, PostResponse
        auth: builder.resource<null, { authenticated: boolean }>([
            '/headers',
            { headers: () => ({ auth: 'foo' }), withCredentials: true },
        ]),
        // types order: Kwargs, FetchResponse, PostPayload, PostResponse
        cats: builder.resource<null, Animal[], Animal, Animal>({
            apiEndpoint: '/cats',
        }),
        // types order: Kwargs, FetchResponse, PostPayload, PostResponse
        cat: builder.resource<{ pk: number }, Animal, Animal>('/cats/${pk}'),
        dogs: builder.router((dogBuilder) => ({
            // types order: Kwargs, FetchResponse, PostPayload, PostResponse
            list: dogBuilder.resource<
                null,
                Animal[],
                Omit<Animal, 'id'>,
                Animal
            >('/dogs/'),
            details: dogBuilder.resource<{ pk: number }, Animal, Animal>(
                '/dogs/${pk}'
            ),
        })),
    }),
});

[coveralls]

coverage: 97.123% (-0.2%) from 97.304%
when pulling 92019c0 on feat/new-router-builder
into 72f0c06 on master.