[O2B-1010] Hide protobuf dependency from the c++ library

[martinboulais]

I have a JIRA ticket

• branch and/or PR name(s) include(s) JIRA ID
• issue has "Fix version" assigned
• issue "Status" is set to "In review"
• PR labels are selected

Notable changes for developers:

• Breaking changes in c++ library:
  • Removed proto bookkeeping API
  • Moved DPL process registration to non-proto API
  • Remove Get runs functions

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.66%. Comparing base (8dbfbfa) to head (6e6bcee).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1530   +/-   ##
=======================================
  Coverage   43.66%   43.66%           
=======================================
  Files         844      844           
  Lines       14275    14275           
  Branches     2555     2555           
=======================================
  Hits         6233     6233           
  Misses       8042     8042           

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[Barthelemy]

tested on my machine, it works