Rework .clang-tidy ruleset

[johannes-esr]

Currently, we only have some clang-tidy rules activated, see https://github.com/eclipse-openbsw/openbsw/blob/main/.clang-tidy

In follow-up PRs more checks shall be enabled and the corresponding warnings shall be fixed.

This includes e.g.

• cppcoreguidelines-*
• portability-*
• readability-*
• misc-*
• modernize-*
• performance-*