feat: add r/sys/teams

[moul]

Addresses #2195 (read this first)

• add r/sys/teams
• configure r/gnoland/home to use r/sys/teams
• pseudocode for gnosdk to call r/sys/teams.GetEditors() on AddPkg hook

Depends on #2164

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 60.14%. Comparing base (9897b66) to head (34c5996).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2184      +/-   ##
==========================================
- Coverage   60.87%   60.14%   -0.73%     
==========================================
  Files         563      556       -7     
  Lines       75193    79465    +4272     
==========================================
+ Hits        45770    47798    +2028     
- Misses      26055    28100    +2045     
- Partials     3368     3567     +199     

Flag	Coverage Δ
contribs/gnodev	61.46% <ø> (ø)
contribs/gnofaucet	14.46% <ø> (-0.86%)	⬇️
gnovm	65.63% <ø> (ø)
misc/genstd	80.54% <ø> (ø)
misc/logos	19.88% <ø> (-0.36%)	⬇️
tm2	62.06% <ø> (-0.03%)	⬇️

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