add icamauth proto

[ItsFunny]

• Targeted PR against correct branch (see CONTRIBUTING.md)

• [ ] Linked to github-issue with discussion and accepted design OR link to spec that describes this work.

• [ ] Wrote tests

• [ ] Updated relevant documentation (docs/)

• [ ] Added a relevant changelog entry to the Unreleased section in CHANGELOG.md

• [ ] Reviewed Files changed in the github PR explorer

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For Admin Use:

• Added appropriate labels to PR (ex. wip, ready-for-review, docs)
• Reviewers Assigned
• Squashed all commits, uses message "Merge PR #XYZ: [title]" (coding standards)

[codecov-commenter]

Codecov Report

Merging #2949 (7a12c53) into dev (0d8075d) will not change coverage. The diff coverage is n/a.

:exclamation: Current head 7a12c53 differs from pull request most recent head 244482e. Consider uploading reports for the commit 244482e to get more accurate results

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@@           Coverage Diff           @@
##              dev    #2949   +/-   ##
=======================================
  Coverage   36.20%   36.20%           
=======================================
  Files         428      428           
  Lines       44828    44828           
=======================================
  Hits        16230    16230           
  Misses      27425    27425           
  Partials     1173     1173           

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