Add submodule

[aperijake]

• Added protego submodule
• Refactored a bit to make way for preprocessing in protego

[trunk-io]

⏱️ 1h 29m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
Build Release, GPU	21m	🟩 🟩
Build Debug, GPU	20m	🟩 🟩
Build Debug, Code Coverage	13m	🟩 🟩
Analyze (python)	13m	🟩 🟩 🟩 🟩 🟩 (+1 more)
Setup	6m	🟥 🟥 🟥 🟩 🟩 (+3 more)
Build Debug	5m	🟩 🟩
Build Release	5m	🟩 🟩
Test Debug	1m	🟩 🟩
Test Release, GPU	1m	🟩 🟩
Test Debug, GPU	1m	🟩 🟩
Test Release	1m	🟩 🟩
Regression Test Release	29s	🟩 🟩
Regression Test Release, GPU	26s	🟩 🟩
Teardown	4s	🟩 🟩

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