feat: mystuff project/studio counts

[faretek1]

there is a function sess.mystuff_projects determined by page. but there is no function to get the number of projects.

here is an external implementation:

def session_mystuff_counts(self: sa.Session) -> tuple[int, int, int]:
    # returns shared count, unshared count, and studio count
    # TODO: classrooms?
    resp = requests.get(
        "https://scratch.mit.edu/mystuff/", headers=self._headers, cookies=self._cookies
    )
    soup = bs4.BeautifulSoup(resp.text, "html.parser")
    shared_elem = soup.select_one("span[data-content='shared-count']")
    unshared_elem = soup.select_one("span[data-content='unshared-count']")
    gallery_elem = soup.select_one("span[data-content='gallery-count']")
    assert shared_elem is not None
    assert unshared_elem is not None
    assert gallery_elem is not None
    shared: str = shared_elem.text.strip()
    unshared: str = unshared_elem.text.strip()
    gallery: str = gallery_elem.text.strip()
    return int(shared), int(unshared), int(gallery)

[faretek1]

unfortunately there is no way to get the size of the trash like this. i think your best bet would be a exponential-binary search