(conan) all used versions of conan packages in a single file

What does this MR do?

• Upgrading versions of conan packages in sight is really painful.
• To simplify the process, we propose to group all versions of conan packages into a simple conan-deps.cmake file.

How to test it?

• just configure + build sight

Additional tests to run

• Build on Windows
• Build on Linux
• Build on macOS

Associated Issues/Merge Requests

• Issues
  • Closes #289 (closed)