feat: pagination of books

[martakam]

This PR adds pagination so we can look through more books when there are more than 12 results.
Some changes in the API so we support looking for a specific page by using the page search param.

A natural place for the current page state would be BookGrid. However, we want to remember the page we were on when we're done with looking at a specific book's details. That's why the state has been moved to the parent component. See 80fd2ed

[johahor]

Tested the application, and when i browse between different pages it briefly says "no books found for this search". While the query runs the data is undefined for a moment, and since isLoading were moved after the !data check, this happens between browsing.

[martakam]

I wanted the pagination to be showed while loading, but that doesn't really seem possible without a lot of extra code for such a small feature, so I prefer we just show a general "Loading books..." when we switch pages.

[hestro]

Works great, approved! Agreed on keeping it simple with "Loading books..." on page switches

[johahor]

Changes works perfect, good work. Agreed on leaving as is for now. "Loading books.." is fine for this project, and we can improve the pagination in the next one.