EXTERN: Adapt to Conan 2.0 - First Steps

Summary

https://gitlab.com/linkahead/linkahead-cpplib/-/issues/7

WARN: *** Conan 1 is legacy and on a deprecation path ***
WARN: *** Please upgrade to Conan 2 ***

See the migration guide.

Also, using Conan 2 allows using the extensions for CLion and Visual Studio.

DoD

• Read the migration guide and decided what we need to do
• Either upgrade this issue or create follow-up(s)