Feat/autocomplete users

[mubarak-mustopha]

What does this PR do, and why?

This PR fixes #1526.
What I added

• It improves the autocomplete feature by prioritizing users in the current topic when using replying to a message.
• It adds a new method get_user_ids_in_topic_narrow to Model

What's already included

• Prioritizing users in the current stream: WriteBox._setup_common_stream_compose() sets the value of WriteBox.recipient_user_ids to the users in the current stream
• Prioritizing real users over bot: Model._update_users_data_from_initial_data() orders user data by status which prioritizes humans over bots.
• Prioritizing users which have recent DMs next

External discussion & connections

• Discussed in #zulip-terminal in topic
• Fully fixes #
• Partially fixes issue #
• Builds upon previous unmerged work in PR #
• Is a follow-up to work in PR #
• Requires merge of PR #
• Merge will enable work on #

How did you test this?

• Manually - Behavioral changes
• Manually - Visual changes
• Adapting existing automated tests
• Adding automated tests for new behavior (or missing tests)
• Existing automated tests should already cover this (only a refactor of tested code)

Self-review checklist for each commit

• It is a minimal coherent idea
• It has a commit summary following the documented style (title & body)
• It has a commit summary describing the motivation and reasoning for the change
• It individually passes linting and tests
• It contains test additions for any new behavior
• It flows clearly from a previous branch commit, and/or prepares for the next commit

Visual changes

Before

autocomplete_unfixed.webm
After

autocomplete_partial_fix.webm