Resource documentation for SDK reference

[mrashed-dev]

Description

This PR has documentation adds for all the resources. Also changes the following:

• Refactor Auth to reflect the recent changes to the endpoints
• Refactor Errors to support API + OAuth errors as well as timeout errors
• Move availability into the calendar resource

JIRA Ticket

https://nylas.atlassian.net/browse/TW-2327

License

I confirm that this contribution is made under the terms of the MIT license and that I have the authority necessary to make this contribution on behalf of its copyright owner.