Investigate clang-tidy modernise to update to modern C++ standards

The clang-tidy tool in LLVM/Clang allows automated updating of code to more modern C++ standards / best practices. A good blog on the topic is here: https://www.kdab.com/clang-tidy-part-1-modernize-source-code-using-c11c14/

Investigate running clang-tidy across the KV-Engine codebase:

• What checkers are suitable for us / match our coding standards?
• Can we automate / integrate into CV to defend the codebase?