Add ability to remove inactive maintainers; introduce Emeritus status

[yurishkuro]

@jaegertracing/jaeger-maintainers

[codecov]

Codecov Report

Merging #2733 (fa511a5) into master (4982b8e) will increase coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #2733      +/-   ##
==========================================
+ Coverage   95.74%   95.76%   +0.02%     
==========================================
  Files         217      217              
  Lines        9628     9628              
==========================================
+ Hits         9218     9220       +2     
+ Misses        337      336       -1     
+ Partials       73       72       -1     

Impacted Files	Coverage Δ
plugin/storage/badger/spanstore/reader.go	95.37% <0.00%> (-0.72%)	⬇️
cmd/query/app/static_handler.go	96.77% <0.00%> (+1.61%)	⬆️
cmd/query/app/server.go	90.16% <0.00%> (+1.63%)	⬆️

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[yurishkuro]

This change is approved by the 2/3 majority (6 out of 8).