Draft: Switch to rapidyaml for loading conditions

Still a work in progress

The goal of this MR is to replace the yaml-cpp library we use when loading conditions by https://github.com/biojppm/rapidyaml

We noticed a big memory consumption comming from yaml-cpp when running HLT2 online, caused by memory fragmentation.

FYI @clemenci

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Validated by

• Core Software
• RTA
• Simulation