Split protos

[uatuko]

Having all gRPC endpoints in one service and all protobuf messages in one .proto file is getting a bit out of hand due larger files. This change is to split out gRPC endpoints (and protobuf messages) into multiple services (and files) to keep them more manageable.

[codecov]

Codecov Report

Patch coverage: 88.12% and project coverage change: +0.19 🎉

Comparison is base (680d1db) 89.47% compared to head (e9dacfa) 89.66%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
+ Coverage   89.47%   89.66%   +0.19%     
==========================================
  Files          29       28       -1     
  Lines        1453     1451       -2     
  Branches      108      108              
==========================================
+ Hits         1300     1301       +1     
+ Misses        132      129       -3     
  Partials       21       21              

Impacted Files	Coverage Δ
src/svc/events.cpp	76.92% <76.92%> (ø)
src/svc/rbac.cpp	82.55% <82.55%> (ø)
src/svc/access.cpp	86.23% <86.23%> (ø)
src/svc/roles.cpp	97.22% <97.22%> (ø)
src/svc/collections.cpp	85.82% <100.00%> (ø)
src/svc/identities.cpp	82.69% <100.00%> (ø)

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