Implementing new API endpoints for the following

[skushagra]

1. Filter books

/v0/books?owner=<owner_id> # get all books which are owned by owner_id

1. Filter appeals

/v0/appeals?borrower=<user_id> # get all appeals where borrower is user_id
/v0/appeals?book=<book_id> # get all appeals where book is book_id
/v0/appeals?borrower=<user_id>&book=<book_id> # get all appeals where borrower is borrower_id and book is book_id

[github-actions]

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