This PR adds several new endpoint calls to pull in the user profile/settings/published posts/get draft

This allows for:

• Automatic USER_ID lookup
• Automatic "Primary Publication" lookup (in this PR I actually remove the publication URL as a parameter, and default to the users default publication. They can then override it. I'm open to feedback)
• Get published posts
• Get existing draft body content back for continued editing.

I also made it so you can change the publication after api instantiation in case you want to change which publication you are working on; and by default it uses the users default publication.

I ran into a lot of issues because I have a custom_domain. This lead to all sorts of cookie issues.

• To solve this I added one extra step to login to do a publication sign-in. This allows for custom domains to get the needed cookies to be able to make API calls, otherwise they don't work.

Some examples of the new calls:

api = Api(
            email=os.getenv("EMAIL"),
            password=os.getenv("PASSWORD"),
        )

user_id = api.get_user_id()
user_publication = api.get_user_primary_publication()
user_publications = api.get_user_publications()

# Get the published posts
posts = api.get_published_posts()

# change publication URL to something else
api.change_publication(user_publication)

# get the draft
draft = api.get_draft(drafts[3].get("id"))
# Conver the draft body back into a list of dicts for further modification
draft_body = json.loads(draft.get("draft_body"))