feat(examples): hall of fame

[leohhhn]

Description

Depends on #2584 for avlpager

Introduces the r/demo/hof realm.

The Hall of Fame is an exhibition that holds items. Users can add their realms to the Hall of Fame by importing the Hall of Fame realm and calling hof.Register() from their init function.

The realm is moderated and the registrations be paused at will.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests
• Added new benchmarks to generated graphs, if any. More info here.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.76%. Comparing base (bd1d76e) to head (e79020a).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2842      +/-   ##
==========================================
- Coverage   63.79%   63.76%   -0.03%     
==========================================
  Files         549      548       -1     
  Lines       78819    78674     -145     
==========================================
- Hits        50279    50164     -115     
+ Misses      25150    25128      -22     
+ Partials     3390     3382       -8     

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