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

[martinboulais]

I have a JIRA ticket

• [X] branch and/or PR name(s) include(s) JIRA ID
• [X] issue has "Fix version" assigned
• [X] issue "Status" is set to "In review"
• [X] 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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 43.58%. Comparing base (4972474) to head (f217081).

:exclamation: Current head f217081 differs from pull request most recent head b5b187b. Consider uploading reports for the commit b5b187b to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1530      +/-   ##
==========================================
+ Coverage   43.53%   43.58%   +0.04%     
==========================================
  Files         833      832       -1     
  Lines       14016    14012       -4     
  Branches     2487     2483       -4     
==========================================
+ Hits         6102     6107       +5     
+ Misses       7914     7905       -9     

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