AlephClientBase and AuthenticatedAlephClientBase

[MHHukiewitz]

Adding abstract base classes for the client classes and add several improvements:

• Many pages of messages can now be iterated over with get_messages_iterator or get_posts_iterator.
• get_posts now returns a PostsResponse type instead of untyped dictionary
• Harmonize get_messages and watch_messages as both should have the same query parameters
• Moved all docstrings from the client classes to their ABCs

[hoh]

Thanks for this proposal for improving the SDK.

The capability of using generators such as your suggestion for get_messages_iterator seems very relevant.

I believe that there is a better way of doing this than adding such method, and I experimented a bit with a new Pull Request here: #58

[MHHukiewitz]

Thanks for this proposal for improving the SDK.

The capability of using generators such as your suggestion for get_messages_iterator seems very relevant.

I believe that there is a better way of doing this than adding such method, and I experimented a bit with a new Pull Request here: #58

Merging the PRs that are lined up would conflict with the proposed changes in #58. I would offer to take these suggested changes and make another PR that integrates better with the new ABCs and MessageCache/DomainNode classes.

[MHHukiewitz]

@hoh and me agreed to continue with merging the branch after another review. I will take care of implementing certain features of #58 in future PRs on the basis of this PR and #59, but will now prioritize UX, especially around deployment and managing of VMs, as new features will hit https://github.com/aleph-im/aleph-vm soon.

@odesenfans please review the requested changes and approve, if no further required.