feat(federation): offline backends handling (epic)

[yamilmedina]

REOPENING FOR TRACK -ALREADY APPROVED PR- WILL MERGE LATER.
#1531

---

PR Submission Checklist for internal contributors

• The PR Title

  • conforms to the style of semantic commits messages¹ supported in Wire's Github Workflow²
  • contains a reference JIRA issue number like SQPIT-764
  • answers the question: If merged, this PR will: ... ³

• The PR Description

  • is free of optional paragraphs and you have filled the relevant parts to the best of your ability

---

What's new in this PR?

Issues

This is the epic branch of previous merged PRs:

• feat: federation msg failed to send handling - part 1: base persistence and failed to send case (AR-3015) #1525
• feat: federation msg failed to send handling - part 2: test coverage (AR-3015)  #1527
• feat: offline backends - handling list-prekeys failed to list (AR-3171) #1662
• feat: offline backends - users metadata (AR-3124) #1698
• feat(offline-backends): users and conversations without metadata refetch pt1. (AR-3123) #1736
• feat(offline-backends): users and conversations without metadata refetch pt2. (AR-3123) #1740
• feat: conversation creation with offline backends (WPB-364) #1774

Testing

Test Coverage (Optional)

• I have added automated test to this contribution

---

PR Post Submission Checklist for internal contributors (Optional)

• Wire's Github Workflow has automatically linked the PR to a JIRA issue

---

PR Post Merge Checklist for internal contributors

• If any soft of configuration variable was introduced by this PR, it has been added to the relevant documents and the CI jobs have been updated.

---

References

1. https://sparkbox.com/foundry/semantic_commit_messages
2. https://github.com/wireapp/.github#usage
3. E.g. feat(conversation-list): Sort conversations by most emojis in the title #SQPIT-764.

[github-actions]

Unit Test Results

   355 files     355 suites   17s ⏱️
1 889 tests 1 811 ✔️ 78 💤 0 ❌

Results for commit 2096232.

♻️ This comment has been updated with latest results.

[codecov-commenter]

Codecov Report

Merging #1548 (2096232) into develop (26bd923) will increase coverage by 0.75%.
The diff coverage is 74.50%.

@@              Coverage Diff              @@
##             develop    #1548      +/-   ##
=============================================
+ Coverage      53.47%   54.22%   +0.75%     
- Complexity      1525     1550      +25     
=============================================
  Files            965      973       +8     
  Lines          35872    36439     +567     
  Branches        3176     3233      +57     
=============================================
+ Hits           19181    19760     +579     
+ Misses         15425    15368      -57     
- Partials        1266     1311      +45